Editing Library of Congress Classification

{{short description|System of library classification}}
{{Use mdy dates|date=November 2023}} {{Use American English|date=November 2023}}
The '''Library of Congress Classification''' ('''LCC''') is a system of [[library classification]] developed by the [[Library of Congress]] in the [[United States]], which can be used for shelving books in a library. LCC is mainly used by large research and [[academic libraries]], while most public libraries and small academic libraries use the [[Dewey Decimal Classification]] system.<ref name="DeweyDiscord">{{Cite news |last=Lavallee |first=Andrew |date=July 20, 2007 |title=Discord Over Dewey: A New Library in Arizona Fans a Heated Debate Over What Some Call the 'Googlization' of Libraries |newspaper=Wall Street Journal |url=https://www.wsj.com/articles/SB118340075827155554 |access-date=May 25, 2013 |quote=Some 95% of U.S. public '''libraries''' use Dewey, and nearly all of the others, the OCLC says, use a closely related Library of Congress system.}}</ref> The classification was developed by [[J. C. M. Hanson|James Hanson]] (chief of the [[Cataloging (library science)|Catalog]] Department), with assistance from [[Charles Martel (librarian)|Charles Martel]], in 1897, while they were working at the Library of Congress.<ref>{{Cite book |last=Dittmann |first=Helena |url=http://archive.org/details/learnlibraryofco0000ditt |title=Learn Library of Congress classification |date=2000 |publisher=Lanham, Md. : Scarecrow Press |others=Internet Archive |isbn=978-0-8108-3696-9}}</ref> It was designed specifically for the purposes and collection of the Library of Congress, to replace the fixed location system developed by [[Thomas Jefferson]].

LCC has been criticized for lacking a sound theoretical basis; many of the classification decisions were driven by the practical needs of that library rather than [[Epistemology|epistemological]] considerations.<ref name=":6">{{cite journal |last=Hickey |first=Doralyn J. |date=1969 |title=Reviewed work: The Use of the Library of Congress Classification: Proceedings of the Institute on the Use of the Library of Congress Classification Sponsored by the American Library Association, Resources and Technical Services Division, Cataloging and Classification Section, New York City, July 7-9, 1966, Richard H. Schimmelpfeng, C. Donald Cook |journal=The Library Quarterly: Information, Community, Policy |volume=39 |issue=3 |pages=294–296 |doi=10.1086/619784 |jstor=4306016}}</ref> Although it divides subjects into broad categories, it is essentially [[Library classification#Types|enumerative]] in nature. That is, it provides a guide to the books actually in one library's collections, not a classification of the world.

== History ==
The central core of the modern Library of Congress was formed from books sold to the government by Thomas Jefferson after the original collection was burned by the British in the [[War of 1812]]. As a result, the original classification system used by the library was of his own invention. However, by the end of the nineteenth century, the collection had grown to over a million volumes and his system was deemed too unwieldy.<ref name=":3">{{Cite web |title=Library of Congress Classification |url=https://www.librarianshipstudies.com/2017/11/library-of-congress-classification.html |date=June 23, 2020 |website=Librarianship Studies & Information Technology |access-date=2022-10-03}}</ref>

[[John Russell Young]], the seventh Librarian of Congress, hired James Hanson and Charles Martel in 1897,<ref>{{Cite web |title=John Russell Young (1840-1899) |url=https://www.loc.gov/item/n83202815/john-russell-young-1840-1899/ |access-date=2022-10-04 |website=Library of Congress}}</ref> who began the development of a new classification system that would more accurately describe the collections the library held. Young's tenure as Librarian ended with his death in 1899, and his successor, [[Herbert Putnam]], continued to implement the updates to the catalog through his long stay in the office.<ref>{{Cite web |title=Herbert Putnam (1861-1955) |url=https://www.loc.gov/item/n85185518/herbert-putnam-1861-1955/ |access-date=2022-10-04 |website=Library of Congress |url-status=dead |archive-url=https://web.archive.org/web/20221004005650/https://www.loc.gov/item/n85185518/herbert-putnam-1861-1955/ |archive-date= 2022-10-04 }}</ref> By the time he departed from his post in 1939, all the classes except K (Law) were well developed.<ref name=":3" />

In creating their classification system, Hanson and Martel evaluated several systems already in existence, including the [[Dewey Decimal System]], [[Charles Ammi Cutter]]'s [[Cutter Expansive Classification]], the [[Index Medicus]],<ref>{{Cite journal|pmc=234678 |pmid=16015800 |date=1916 |last1=Martel |first1=C. |title=Remarks on Cataloguing and Classification |journal=Bulletin of the Medical Library Association |volume=5 |issue=4 |pages=43–45 }}</ref> and the [[Putnam Classification System]] (developed while Putnam was head librarian at the [[Minneapolis Public Library]]).<ref>Andy Sturdevant. [https://www.minnpost.com/stroll/2014/02/cracking-spine-hennepin-county-librarys-many-hidden-charms "Cracking the spine on Hennepin County Library's many hidden charms".] ''[[MinnPost]]'', 02/05/14.</ref> The one closest to their needs was Cutter's; however, he died before the completion of his system.<ref name=":4">LaMontagne, Leo E. ''American Library Classification: With Special Reference to the Library of Congress''. Hamden, CT, Shoe String Press. 1961, p. 210.</ref> Hanson and Martel thus decided to develop their own unique system, strongly based on his ideas. They published their first outline of the classification scheme in 1904.<ref name=":3" /> Development of the classes continued throughout the twentieth century. The last class to be developed was K (Law): the first K schedule was published in 1969 and not completed until the 2004 publication of KB.<ref name=":3" />

From 1996 onwards, the LCC schedules were available online, and since 2013, there have been no new print editions of the classification system. All updates are now distributed by the Library's Cataloging Distribution Service entirely online.<ref name=":3" />

== <span class="anchor" id="Design and Organization"></span>Design and organization ==
LCC divides all knowledge into twenty-one basic classes, each given a single letter of the alphabet as an identifier. Most of these classes are divided further into two and three level sub-classes.<ref name=":0">{{Cite web |title=Library of Congress Classification |url=https://www.loc.gov/catdir/cpso/lcc.html |access-date=2022-10-03 |website=Library of Congress }}</ref> With these sub-classes, numerical ranges are assigned to topics, going from more general to more specific. Unlike in the Dewey Decimal Classification, where the numbers assigned to a topic iterate throughout the system (e.g., the ".05" tag indicated a periodical publication on the topic), the LCC numerical ranges are strictly hierarchal, only corresponding to their level on the outline. LCC is enumerative, meaning that it lists all the classes in officially published schedules, which are updated as needed by the Library of Congress.<ref name=":0" />
[[File:G&G LCC Call number.png|alt=GB 2403.2 .B44 2010 is described as components based on how such an LCC call number is formed: G being the class, GB being in the subclass, 2403.2 being the topic number, .B44 being the Cutter Number, and 2010 being the publication date.|thumb|The call number for ''Glaciers and Glaciation'' (2nd edt.) by Benn & Evans. This indicates that it belongs to the broad class of  "Geography, Anthropology, Recreation," the subclass of "Physical Geography," and the topic of "Ice. Glaciers. Ice sheets. Sea ice." B44 is the Cutter number, after the first author Benn, and 2010 represents the publication year.]]

After the range of numbers making up the topical division, call numbers often also include one or more Cutter numbers, modeled after the unfinished [[Cutter Expansive Classification]] index. The full LCC schedules contain tables that describe Cutter numbers for certain types of media, collections of work, and geographical areas.<ref name=":3" /> Cutter numbers also can take the form of an author-specific code, containing a letter and several numbers corresponding to the author's last name. This serves to further distinguish publications and nominally alphabetize volumes within a topic section. The final component of a typical LCC call-number is the publication year, in full.<ref>{{Cite book |last=Chan |first=Lois Mai |url=https://www.worldcat.org/oclc/41211262 |title=A guide to the Library of Congress classification |date=1999 |publisher=Libraries Unlimited |others=Lois Mai Chan |isbn=1-56308-499-6 |edition=5th |location=Englewood, Colo. |oclc=41211262}}</ref> Library collections can add modifiers to distinguish specific volumes, such as "Copy 1."<ref name="DeweyDiscord" />

LCC should not be confused with [[Library of Congress Control Number]]s (LCCN), which are assigned to all books (and authors) and defines online catalog entries.<ref name="authors" group="lower-alpha" /> Library of Congress Classification is also distinct from [[Library of Congress Subject Headings]], the system of labels such as "Glaciers" and "Glaciers—Fiction" that describe contents systematically.<ref name="subjects" group="lower-alpha" />

One variation from the original LCC system is the [[National Library of Medicine classification]] system (NLM), which uses the initial letters ''W'' and ''QS''–''QZ'', which are not used by LCC. Some libraries use NLM in conjunction with LCC, eschewing LCC's R, QM, and QP, which overlap with NLM's schema.<ref>Taylor, A. G., & Joudrey, D.N. (2009). The organization of information. 3rd ed. Englewood: Libraries Unlimited.</ref><ref>Chan, L. M.(2007). Cataloging and classification: An introduction. 3rd ed. Scarecrow Press.</ref> Another is the Canadian Universities and the Canadian National Library using FC for Canadian History, a subclass that LCC has not officially adopted, but which it has agreed not to use for anything else.<ref name=":1">{{cite web |last1=National Library of Canada |title=Class FC: a classification for Canadian history |url=http://publications.gc.ca/collections/Collection/SN3-61-1994E.pdf |access-date=May 21, 2018 |website=PDF publication |publisher=National Library of Canada}}</ref><ref name=":2">{{cite web |last1=Rutherford |first1=D |title=Canadian History Call Numbers |url=http://library.queensu.ca/techserv/cat/Sect03/c03Canclass.html#double |access-date=May 21, 2018 |website=Queens University Library |archive-date=January 23, 2021 |archive-url=https://web.archive.org/web/20210123214623/https://library.queensu.ca/techserv/cat/Sect03/c03Canclass.html#double |url-status=dead }}</ref>

=== Classes ===
{| class="wikitable"
|-
!Letter||Subject area<ref name=":0" />
|-
|A||[[#Class A – general works|General Works]]
|-
|B||[[#Class B – Philosophy, Psychology, Religion|Philosophy, Psychology, Religion]]
|-
|C||[[#Class C – Auxiliary Sciences of History|Auxiliary Sciences of History]]
|-
|D||[[Library of Congress Classification#Class D – World History and History of Europe, Asia, Africa, Australia, New Zealand, etc.|World History and History of Europe, Asia, Africa, Australia, New Zealand, etc.]]
|-
|E||[[Library of Congress Classification#Class E – History of the Americas|History of America]]
|-
|F||[[Library of Congress Classification#Class F – Local History of the Americas|History of the Americas]]
|-
|G||[[#Class G – Geography, Anthropology, Recreation|Geography, Anthropology, and Recreation]]
|-
|H||[[#Class H – Social Sciences|Social Sciences]]
|-
|J||[[#Class J – Political Science|Political Science]]
|-
|K||[[#Class K – Law|Law]]
|-
|L||[[#Class L – Education|Education]]
|-
|M||[[#Class M – Music|Music]]
|-
|N||[[#Class N – Fine Arts|Fine Arts]]
|-
|P||[[#Class P – Language and Literature|Language and Literature]]
|-
|Q||[[#Class Q – Science|Science]]
|-
|R||[[#Class R – Medicine|Medicine]]
|-
|S||[[#Class S – Agriculture|Agriculture]]
|-
|T||[[#Class T – Technology|Technology]]
|-
|U||[[#Class U – Military Science|Military Science]]
|-
|V||[[#Class V – Naval Science|Naval Science]]
|-
|Z||[[#Class Z – Bibliography, Library Science|Bibliography, Library Science, and General Information Resources]]
|}

== <span class="anchor" id="Use and Criticism"></span>Use and criticism ==

Together, the Dewey Decimal System (DDC) and LCC make up the two main classification system used in U.S. libraries.<ref name="DeweyDiscord" /> LCC is favored by large academic and research libraries.

Systems of classification can be evaluated on several metrics, including expressiveness (the ability of the numeration system to express the hierarchal and correlative relationships between topics), hospitality (the ability of the system to accommodate new subjects), and brevity (length of call numbers).<ref name=":3" /> While LCC is significantly less expressive than DDC, it is extremely hospitable, mainly in the fact that five classes (I, O, W, X, and Y) lack any assignment to topics.<ref name=":4" /> LCC call numbers also tend to be shorter than those in DDC.

The main difference between DDC and LCC is their approach to classifying. Dewey's system is a comprehensive classification to all topics, with no regard to the actual collections a library might hold. While this has allowed it to be successfully adapted into more modern classification systems for use outside of libraries, such as the [[Universal Decimal Classification]] (UDC),<ref>"A Brief Introduction to the Dewey Decimal Classification". OCLC. Archived from the original on May 3, 2013. Retrieved November 16, 2013.</ref> it does make it more unwieldy for large or specialized collections. On the other hand, Hanson and Martel designed LCC specifically for library use, which means while it does not completely enumerate the world, it does more reflect what books a library might hold.<ref name=":6" />

Because LCC was designed around the collections of the Library of Congress, it has an American, European, and Christian bias, as reflected mainly in the earlier developed schedules of D (World History), E and F (History of the Americas), and B (Philosophy, Psychology, Religion). On the other hand, the later-developed K (Law) gives fairly even weight to global law.<ref name=":0" /> Today, the various schedules are maintained and revised by the Library's Policy and Standards Division, in conjunction with experts in each field. However, updating various schedules with classification biases is generally assumed to be impractical due to the massive workload that would result in,<ref name=":3" />  especially as the "discipline" based classes of LCC have been entrenched in the average library user's mind.<ref name=":5">{{Cite journal |last1=Howard |first1=Sara A. |last2=Knowlton |first2=Steven A. |date=2018 |title=Browsing through Bias: The Library of Congress Classification and Subject Headings for African American Studies and LGBTQIA Studies |journal=Library Trends |volume=67 |issue=1 |pages=74–88 |doi=10.1353/lib.2018.0026 |s2cid=69496735 |via=Muse|hdl=2142/101937 |hdl-access=free }}</ref>

Like all classification systems, LCC struggles with catering to interdisciplinary scholars and topics, as ultimately, a book can only be shelved in a single location.<ref name=":5" />  Additionally, LCC has a problem with "othering" marginalized groups, making works related to or authored by members of these groups particularly difficult to locate.<ref name=":5" /> This is not a new issue, and libraries with more specialized collections about minority groups or issues sometimes eschew LCC,<ref name=":5" /> with one example alternative classification being the [[Harvard–Yenching Classification]], specifically developed for Chinese language materials.

== <span class="anchor" id="Full Classification Outline"></span>Full classification outline ==

===Class A – general works===
{{Main|Library of Congress Classification:Class A -- General Works}}
* [[Library of Congress Classification:Class A -- General Works#AC – collections. series. collected works|Subclass AC]] – [[anthology|Collection]]s. Series. Collected works
* [[Library of Congress Classification:Class A -- General Works#AE – encyclopedias|Subclass AE]] – [[Encyclopedias]]
* [[Library of Congress Classification:Class A -- General Works#AG – dictionaries and other general reference works|Subclass AG]] – [[Dictionaries]] and other general [[reference works]]
* [[Library of Congress Classification:Class A -- General Works#AI – indexes|Subclass AI]] – [[Bibliographic index|Indexes]]
* [[Library of Congress Classification:Class A -- General Works#AM – museums; collectors and collecting|Subclass AM]] – [[Museums]]. Collectors and collecting
* [[Library of Congress Classification:Class A -- General Works#AN – newspapers|Subclass AN]] – [[Newspapers]]
* [[Library of Congress Classification:Class A -- General Works#AP – periodicals|Subclass AP]] – [[Periodicals]]
* [[Library of Congress Classification:Class A -- General Works#AS – academies and learned societies|Subclass AS]] – Academies and [[learned societies]]
* [[Library of Congress Classification:Class A -- General Works#AY – yearbooks; almanacs; directories|Subclass AY]] – [[Yearbooks]]. [[Almanacs]]. [[Business directory|Directories]]
* [[Library of Congress Classification:Class A -- General Works#AZ – history of scholarship and learning; the humanities|Subclass AZ]] – History of scholarship and [[learning]]. The [[humanities]]

===Class B – Philosophy, Psychology, Religion===
{{Main|Library of Congress Classification:Class B -- Philosophy, Psychology, Religion}}
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#B - Philosophy (General)|Subclass B]] – [[Outline of philosophy|Philosophy]] (General)
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BC - Logic|Subclass BC]] – [[Outline of logic|Logic]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BD - Speculative philosophy|Subclass BD]] – Speculative philosophy
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BF - Psychology|Subclass BF]] – [[Outline of psychology|Psychology]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BH - Aesthetics|Subclass BH]] – [[Outline of aesthetics|Aesthetics]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BJ - Ethics|Subclass BJ]] – [[Outline of ethics|Ethics]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BL - Religions. Mythology. Rationalism|Subclass BL]] – [[Outline of religion|Religions]]. [[Mythology]]. [[Rationalism]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BM - Judaism|Subclass BM]] – [[Outline of Judaism|Judaism]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BP - Islam. Baháʼí Faith. Theosophy|Subclass BP]] – [[Outline of Islam|Islam]]. [[Baháʼí Faith|Baháʼísm]]. [[Theosophy]], etc.
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BQ - Buddhism|Subclass BQ]] – [[Outline of Buddhism|Buddhism]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BR - Christianity|Subclass BR]] – [[Outline of Christianity|Christianity]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BS - The Bible|Subclass BS]] – [[The Bible]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BT - Doctrinal Theology|Subclass BT]] – Doctrinal theology
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BV - Practical Theology|Subclass BV]] – [[Practical theology]]
* [[Library of Congress Classification:Class B -- Philosophy, Psychology, Religion#BX - Christian Denominations|Subclass BX]] – [[Library of Congress Classification:Class B, subclass BX -- Christian Denominations|Christian Denominations]]

===Class C – Auxiliary Sciences of History===
{{Main|Library of Congress Classification:Class C -- Auxiliary Sciences of History}}
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#C - Auxiliary Sciences of History|Subclass C]] – [[Auxiliary Sciences of History]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CB - History of Civilization|Subclass CB]] – History of [[Civilization]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CC - Archaeology|Subclass CC]] – [[Outline of archaeology|Archaeology]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CD - Diplomatics; Archives; Seals|Subclass CD]] – [[Diplomatics]]. [[Archives]]. [[Seal (emblem)|Seals]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CE - Technical Chronology; Calendar|Subclass CE]] – Technical Chronology; [[Calendar]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CJ - Numismatics|Subclass CJ]] – [[Numismatics]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CN - Inscriptions; Epigraphy|Subclass CN]] – [[Inscriptions]]; [[Epigraphy]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CR - Heraldry|Subclass CR]] – [[Heraldry]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CS - Genealogy|Subclass CS]] – [[Genealogy]]
* [[Library of Congress Classification:Class C -- Auxiliary Sciences of History#CT - Biography|Subclass CT]] – [[Biography]]

===Class D – World History and History of Europe, Asia, Africa, Australia, New Zealand, etc.===
{{Main|Library of Congress Classification:Class D -- History, General and Old World}}
* [[Library of Congress Classification:Class D -- History, General and Old World#D - History (General)|Subclass D]] – [[Outline of history|History]] (General)
* [[Library of Congress Classification:Class D -- History, General and Old World#DA – History of Great Britain – History of Ireland – History of the British Isles|Subclass DA]] – [[History of the British Isles|Great Britain]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DAW – History of Central Europe|Subclass DAW]] – [[Central Europe#Historical perspective|Central Europe]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DB – History of Austria – Liechtenstein – Hungary – Czechoslovakia|Subclass DB]] – [[History of Austria|Austria]] – [[History of Liechtenstein|Liechtenstein]] – [[History of Hungary|Hungary]] – [[Czechoslovakia]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DC – History of France – Andorra – Monaco|Subclass DC]] – [[History of France|France]] – [[History of Andorra|Andorra]] – [[History of Monaco|Monaco]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DD – History of Germany|Subclass DD]] – [[History of Germany|Germany]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DE – History of the Greco-Roman World|Subclass DE]] – [[Outline of classical studies|Greco-Roman World]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DF – History of Greece|Subclass DF]] – [[History of Greece|Greece]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DG – History of Italy – Malta|Subclass DG]] – [[History of Italy|Italy]] – [[History of Malta|Malta]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DH – History of Low Countries – Benelux Countries|Subclass DH]] – Low Countries – [[Benelux]] Countries
* [[Library of Congress Classification:Class D -- History, General and Old World#DJ – History of the Netherlands (Holland)|Subclass DJ]] – [[History of the Netherlands|Netherlands]] (Holland)
* [[Library of Congress Classification:Class D -- History, General and Old World#DJK – History of Eastern Europe (General)|Subclass DJK]] – [[Eastern Europe#History|Eastern Europe]] (General)
* [[Library of Congress Classification:Class D -- History, General and Old World#DK – History of Russia; Soviet Union; Former Soviet Republics – History of Poland|Subclass DK]] – [[History of Russia|Russia]]. [[Soviet Union]]. [[Republics of the Soviet Union|Former Soviet Republics]] – [[History of Poland|Poland]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DL – History of Northern Europe;  Scandinavia|Subclass DL]] – [[Northern Europe#History|Northern Europe]]. [[History of Scandinavia|Scandinavia]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DP – History of Spain – Portugal|Subclass DP]] – [[History of Spain|Spain]] – [[History of Portugal|Portugal]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DQ – History of Switzerland|Subclass DQ]] – [[History of Switzerland|Switzerland]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DR – History of the Balkan Peninsula|Subclass DR]] – [[History of the Balkans|Balkan Peninsula]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DS – History of Asia|Subclass DS]] – [[History of Asia|Asia]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DT – History of Africa|Subclass DT]] – [[History of Africa|Africa]]
* [[Library of Congress Classification:Class D -- History, General and Old World#DU – History of Oceania (South Seas)|Subclass DU]] – [[Oceania]] (South Seas)
* [[Library of Congress Classification:Class D -- History, General and Old World#DX – History of Romanies|Subclass DX]] – [[History of the Romani people|Romanies]]

===Class E  – History of the Americas===
{{Main|Library of Congress Classification:Class E -- History of America}}
* Class E does not have any subclasses.

===Class F – Local History of the Americas===
{{Main|Library of Congress Classification:Class F -- Local History of the United States and British, Dutch, French, and Latin America}}
* Class F does not have any subclasses, though Canadian Universities and the Canadian National Library use FC for Canadian History, a subclass that LCC has not officially adopted, but which it has agreed not to use for anything else.<ref name=":1" /><ref name=":2" />

===Class G – Geography, Anthropology, Recreation===
{{Main|Library of Congress Classification:Class G -- Geography. Anthropology. Recreation}}
* [[Library of Congress Classification:Class G, subclass G -- Geography (General). Atlases. Maps|Subclass G]] – [[Outline of geography|Geography]] (General). [[Atlas]]es. [[Maps]]
* [[Library of Congress Classification:Class G, subclass GA -- Mathematical geography. Cartography|Subclass GA]] – [[Mathematical geography]]. [[Cartography]]
* [[Library of Congress Classification:Class G, subclass GB -- Physical geography|Subclass GB]] – [[Physical geography]]
* [[Library of Congress Classification:Class G, subclass GC -- Oceanography|Subclass GC]] – [[Oceanography]]
* [[Library of Congress Classification:Class G -- Geography. Anthropology. Recreation#GE - Environmental Sciences|Subclass GE]] – [[Environmental Sciences]]
* [[Library of Congress Classification:Class G -- Geography. Anthropology. Recreation#GF - Human ecology; Anthropogeography|Subclass GF]] – [[Human ecology]]. [[Anthropogeography]]
* [[Library of Congress Classification:Class G, subclass GN -- Anthropology|Subclass GN]] – [[Outline of anthropology|Anthropology]]
* [[Library of Congress Classification:Class G, subclass GR -- Folklore|Subclass GR]] – [[Folklore]]
* [[Library of Congress Classification:Class G, subclass GT -- Manners and Customs (General)|Subclass GT]] – [[Manners]] and customs (General)
* [[Library of Congress Classification:Class G, subclass GV -- Recreation and Leisure|Subclass GV]] – [[Recreation]]. [[Leisure]]

===Class H – Social Sciences===
{{Main|Library of Congress Classification:Class H -- Social sciences}}
* [[Library of Congress Classification:Class H -- Social sciences#H - Social sciences (General)|Subclass H]] – [[Outline of social sciences|Social science]] (General)
* [[Library of Congress Classification:Class H -- Social sciences#HA - Statistics|Subclass HA]] – [[Outline of statistics|Statistics]]
* [[Library of Congress Classification:Class H -- Social sciences#HB - Economic theory; Demography|Subclass HB]] – [[Outline of economics|Economic theory]]. [[Demography]]
* [[Library of Congress Classification:Class H -- Social sciences#HC - Economic history and conditions|Subclass HC]] – [[Economic history]] and conditions
* [[Library of Congress Classification:Class H -- Social sciences#HD - Industries; Land use; Labor|Subclass HD]] – [[Outline of industry|Industries]]. Land use. [[Labour (economics)|Labor]]
* [[Library of Congress Classification:Class H -- Social sciences#HE - Transportation and communications|Subclass HE]] – [[Outline of transport|Transportation]] and [[Outline of communication|communications]]
* [[Library of Congress Classification:Class H -- Social sciences#HF - Commerce|Subclass HF]] – [[Commerce]]
* [[Library of Congress Classification:Class H -- Social sciences#HG - Finance|Subclass HG]] – [[Outline of finance|Finance]]
* [[Library of Congress Classification:Class H -- Social sciences#HJ - Public finance|Subclass HJ]] – [[Public finance]]
* [[Library of Congress Classification:Class H -- Social sciences#HM - Sociology (General)|Subclass HM]] – [[Outline of sociology|Sociology]] (General)
* [[Library of Congress Classification:Class H -- Social sciences#HN - Social history and conditions; Social problems; Social reform|Subclass HN]] – [[Social history]] and conditions. [[Social problems]]. [[Social reform]]
* [[Library of Congress Classification:Class H -- Social sciences#HQ - The family; Marriage; Woman; Sexuality|Subclass HQ]] – The family. Marriage, Women and Sexuality
* [[Library of Congress Classification:Class H -- Social sciences#HS - Societies|Subclass HS]] – Societies: [[secret society|secret]], benevolent, etc.
* [[Library of Congress Classification:Class H -- Social sciences#HT - Communities; Classes; Races|Subclass HT]] – [[Outline of community|Communities]]. [[Social class|Classes]]. [[Race (classification of humans)|Races]]
* [[Library of Congress Classification:Class H -- Social sciences#HV - Social pathology; Social and public welfare; Criminology|Subclass HV]] – [[Social pathology]]. Social and [[public welfare]]. [[Criminology]]
* [[Library of Congress Classification:Class H -- Social sciences#HX - Socialism; Communism; Anarchism|Subclass HX]] – [[Socialism]]. [[Communism]]. [[Outline of anarchism|Anarchism]]

===Class J – Political Science===
{{Main|Library of Congress Classification:Class J -- Political science}}
* [[Library of Congress Classification:Class J -- Political science#J - General legislative and executive papers|Subclass J]] – General legislative and executive papers
* [[Library of Congress Classification:Class J -- Political science#JA - Political science (General)|Subclass JA]] – [[Outline of politics|Political science]] (General)
* [[Library of Congress Classification:Class J -- Political science#JC - Political theory. The state. Theories of the state|Subclass JC]] – [[Political theory]]
* [[Library of Congress Classification:Class J -- Political science#JF - Political institutions and public administration|Subclass JF]] – [[Political institution]]s and [[public administration]]
* [[Library of Congress Classification:Class J -- Political science#JJ - Political institutions and public administration - North America|Subclass JJ]] – Political institutions and public administration (North America)
* [[Library of Congress Classification:Class J -- Political science#JK - Political institutions and public administration - United States|Subclass JK]] – Political institutions and public administration (United States)
* [[Library of Congress Classification:Class J -- Political science#JL - Political institutions and public administration - Canada, Latin America, etc|Subclass JL]] – Political institutions and public administration (Canada, Latin America, etc.)
* [[Library of Congress Classification:Class J -- Political science#JN - Political institutions and public administration - Europe|Subclass JN]] – Political institutions and public administration (Europe)
* [[Library of Congress Classification:Class J -- Political science#JQ - Political institutions and public administration - Asia, Africa, Australia, Pacific Area, etc|Subclass JQ]] – Political institutions and public administration (Asia, Africa, Australia, Pacific Area, etc.)
* [[Library of Congress Classification:Class J -- Political science#JS - Local government. Municipal government|Subclass JS]] – Local government. [[Municipal government]]
* [[Library of Congress Classification:Class J -- Political science#JV - Colonies and colonization,  Emigration and Immigration.  International migration|Subclass JV]] – Colonies and [[colonization]]. Emigration and immigration. International migration
* [[Library of Congress Classification:Class J -- Political science#JX - International law (obsolete)|Subclass JX]] – [[International law]], see JZ and KZ (obsolete)
* [[Library of Congress Classification:Class J -- Political science#JZ - International relations|Subclass JZ]] – [[International relations]]

===Class K – Law===
{{Main|Library of Congress Classification:Class K -- Law}}
* [[Library of Congress Classification:Class K -- Law#K - Law in general. Comparative and uniform law. Jurisprudence|Subclass K]] – [[Outline of law|Law]] in general. Comparative and uniform law. [[Jurisprudence]]
* [[Library of Congress Classification:Class K -- Law#KB - Religious law in general. Comparative religious law. Jurisprudence|Subclass KB]] – [[Religious law]] in general. Comparative religious law. Jurisprudence
* [[Library of Congress Classification:Class K -- Law#KBM - Jewish law|Subclass KBM]] – [[Jewish law]]
* [[Library of Congress Classification:Class K -- Law#KBP - Islamic law|Subclass KBP]] – [[Sharia|Islamic law]]
* [[Library of Congress Classification:Class K -- Law#KBR - History of canon law|Subclass KBR]] – History of [[canon law]]
* [[Library of Congress Classification:Class K -- Law#KBS - Canon law of Eastern churches|Subclass KBS]] – Canon law of [[Eastern Christianity|Eastern churches]]
* [[Library of Congress Classification:Class K -- Law#KBT - Canon law of Eastern Rite Churches in Communion with the Holy See of Rome|Subclass KBT]] – Canon law of [[Eastern Catholic Churches|Eastern Rite Churches in Communion with the Holy See of Rome]]
* [[Library of Congress Classification:Class K -- Law#KBU - Law of the Roman Catholic Church. The Holy See|Subclass KBU]] – Law of the Roman Catholic Church. The [[Holy See]]
* [[Library of Congress Classification:Class K -- Law#KD - United Kingdom|Subclasses – KD/KDK]] - [[United Kingdom]] and [[Ireland]]
* [[Library of Congress Classification:Class K -- Law#KDZ - Law of America. North America|Subclass KDZ]] – America. [[Law of North America|North America]]
* [[Library of Congress Classification:Class K -- Law#KE - Canada|Subclass KE]] – [[Law of Canada|Canada]]
* [[Library of Congress Classification:Class K -- Law#KF - United States|Subclass KF]] – [[Law of the United States|United States]]
* [[Library of Congress Classification:Class K -- Law#KG - Latin America|Subclass KG]] – [[Crime and violence in Latin America|Latin America]] – [[Mexico]] and [[Central America]] – West Indies. Caribbean area
* [[Library of Congress Classification:Class K -- Law#KH - South America|Subclass KH]] – [[Law in South America|South America]]
* [[Library of Congress Classification:Class K -- Law#KJ - Europe. History. Countries A-F|Subclasses KJ-KKZ]] – [[Law in Europe|Europe]]
* [[Library of Congress Classification:Class K -- Law#KL - Asia and Eurasia. History. Countries (A-Z)|Subclasses KL-KWX]] – [[Legal systems in Asia|Asia]] and Eurasia, [[Law in Africa|Africa]], Pacific Area, and Antarctica
* [[Library of Congress Classification:Class K -- Law#KU - Australia. New Zealand|Subclass KU/KUQ]] – Law of [[Australia]] and [[New Zealand]]
* [[Library of Congress Classification:Class K -- Law#KZ - Law of Nations. Law of Seas. Law of Space|Subclass KZ]] – [[Public international law|Law of nations]]

===Class L – Education===
{{Main|Library of Congress Classification:Class L -- Education}}
* [[Library of Congress Classification:Class L -- Education#L - Education (General)|Subclass L]] – [[Outline of education|Education]] (General)
* [[Library of Congress Classification:Class L -- Education#LA - History of Education|Subclass LA]] – [[History of education]]
* [[Library of Congress Classification:Class L -- Education#LB - Theory and practice of education|Subclass LB]] – [[Education theory|Theory]] and practice of education
* [[Library of Congress Classification:Class L -- Education#LC - Special aspects of education|Subclass LC]] – Special aspects of education
* [[Library of Congress Classification:Class L -- Education#LD - Individual institutions - United States|Subclass LD]] – [[List of universities in the United States|Individual institutions – United States]]
* [[Library of Congress Classification:Class L -- Education#LE - Individual institutions - America (except United States)|Subclass LE]] – Individual institutions – America (except United States)
* [[Library of Congress Classification:Class L -- Education#LF - Individual institutions - Europe|Subclass LF]] – [[List of universities in Europe|Individual institutions – Europe]]
* [[Library of Congress Classification:Class L -- Education#LG - Individual institutions - Asia, Africa, Indian Ocean islands, Australia, New Zealand, Pacific Islands|Subclass LG]] – Individual institutions – [[List of universities in Asia|Asia]], [[List of universities in Africa|Africa]], Indian Ocean islands, [[List of universities in Australia|Australia]], [[List of universities in New Zealand|New Zealand]], Pacific islands
* [[Library of Congress Classification:Class L -- Education#LH - College and school magazines and papers|Subclass LH]] – [[List of student newspapers|College and school magazines and papers]]
* [[Library of Congress Classification:Class L -- Education#LJ - Student fraternities and societies, United States|Subclass LJ]] – Student [[fraternities]] and [[student society|societies]], United States
* [[Library of Congress Classification:Class L -- Education#LT - Textbooks|Subclass LT]] – [[Textbooks]]

===Class M – Music===
{{Main|Library of Congress Classification:Class M -- Music}}
* [[Library of Congress Classification:Class M -- Music#M - Printed Music|Subclass M]] – [[Outline of music|Music]]
* [[Library of Congress Classification:Class M -- Music#ML - Literature on music|Subclass ML]] – Literature on music
* [[Library of Congress Classification:Class M -- Music#MT - Musical instruction and study|Subclass MT]] – Instruction and study

===Class N – Fine Arts===
{{Main|Library of Congress Classification:Class N -- Fine Arts}}
* [[Library of Congress Classification:Class N -- Fine Arts#N - Visual Arts|Subclass N]] – [[Visual arts|Visual Arts]]
* [[Library of Congress Classification:Class N -- Fine Arts#NA - Architecture|Subclass NA]] – [[Outline of architecture|Architecture]]
* [[Library of Congress Classification:Class N -- Fine Arts#NB - Sculpture|Subclass NB]] – [[Outline of sculpture|Sculpture]]
* [[Library of Congress Classification:Class N -- Fine Arts#NC - Drawing. Design. Illustration|Subclass NC]] – [[Outline of drawing and drawings|Drawing]]. [[Outline of design|Design]]. [[Illustration]]
* [[Library of Congress Classification:Class N -- Fine Arts#ND - Painting|Subclass ND]] – [[Outline of painting|Painting]]
* [[Library of Congress Classification:Class N -- Fine Arts#NE - Print Media|Subclass NE]] – Print media
* [[Library of Congress Classification:Class N -- Fine Arts#NK - Decorative arts|Subclass NK]] – [[Decorative arts]]
* [[Library of Congress Classification:Class N -- Fine Arts#NX - Arts in General|Subclass NX]] – [[The arts|Arts in general]]

===Class P – Language and Literature===
{{main|Library of Congress Classification:Class P -- Language and Literature}}
[[File:RyersonUniversityLibrary.JPG|thumb|The PN-subclass shelf.]]
* [[Library of Congress Classification:Class P, subclass P -- Philology linguistics|Subclass P]] – [[Philology]]. [[Outline of linguistics|Linguistics]]
* [[Library of Congress Classification:Class P, subclass PA -- Greek language and literature|Subclass PA]] – [[Greek language]] and [[Greek literature|literature]]. [[Latin language]] and [[Latin literature|literature]]
* [[Library of Congress Classification:Class P, subclass PB -- Modern languages and Celtic languages|Subclass PB]] – [[Modern language]]s. [[Celtic language]]s and literature
* [[Library of Congress Classification:Class P, subclass PC -- Romanic languages|Subclass PC]] – [[Romance languages]]
* [[Library of Congress Classification:Class P, subclass PD -- Germanic languages|Subclass PD]] – [[Germanic languages]]. [[Scandinavian languages]]
* [[Library of Congress Classification:Class P, subclass PE -- English language|Subclass PE]] – [[English language]]
* [[Library of Congress Classification:Class P, subclass PF -- West Germanic languages|Subclass PF]] – [[West Germanic languages]]
* [[Library of Congress Classification:Class P, subclass PG -- Slavic, Baltic and Albanian languages|Subclass PG]] – [[Slavic languages]] and literature. [[Baltic languages]]. [[Albanian language]]
* [[Library of Congress Classification:Class P, subclass PH -- Uralic and Basque languages|Subclass PH]] – [[Uralic language]]s. [[Basque language]]
* [[Library of Congress Classification:Class P, subclass PJ -- Oriental philology and literature|Subclass PJ]] – [[Oriental languages]] and literatures
* [[Library of Congress Classification:Class P, subclass PK -- Indo-Iranian philology and literature|Subclass PK]] – [[Indo-Iranian languages]] and literature
* [[Library of Congress Classification:Class P -- Language and Literature#PL -- Languages and literature of Eastern Asia, Africa, Oceania|Subclass PL]] – Languages and literature of [[Languages of East Asia|Eastern Asia]], [[Languages of Africa|Africa]], [[Languages of Oceania|Oceania]]
* [[Library of Congress Classification:Class P, subclass PM -- Hyperborean, Indian and artificial languages|Subclass PM]] – [[Hyperborea]]n, [[Indigenous languages of the Americas|Native American]], and [[artificial languages]]
* [[Library of Congress Classification:Class P, subclass PN -- General Literature|Subclass PN]] – [[Outline of literature|Literature]] (General)
* [[Library of Congress Classification:Class P, subclass PQ -- French literature - Italian literature - Spanish literature - Portuguese literature|Subclass PQ]] – [[French literature]] – [[Italian literature]] – [[Spanish literature]] – [[Portuguese literature]]
* [[Library of Congress Classification:Class P, subclass PR -- English literature|Subclass PR]] – [[English literature]]
* [[Library of Congress Classification:Class P, subclass PS -- American Literature|Subclass PS]] – [[American literature]]
* [[Library of Congress Classification:Class P, subclass PT -- Germanic literature|Subclass PT]] – [[German literature]] – [[Dutch literature]] – [[Flemish literature]] since 1830 – [[Afrikaans literature]] -[[Scandinavian literature]] – [[Old Norse literature]]: Old Icelandic and Old Norwegian – Modern [[Icelandic literature]] – [[Faroese literature]] – [[Danish literature]] – [[Norwegian literature]] – [[Swedish literature]]
* [[Library of Congress Classification:Class P, subclass PZ -- Fiction and juvenile belles lettres|Subclass PZ]] – [[Outline of fiction|Fiction]] and juvenile [[belles lettres]]

===Class Q – Science===
[[Image:LibraryOfCongressClassification.jpg|thumbnail|right|200px|[[Java programming]] books in the QA subclass.]]
{{Main|Library of Congress Classification:Class Q -- Science}}
* [[Library of Congress Classification:Class Q -- Science#Q - Science (General)|Subclass Q]] – [[Outline of science|Science]] (General)
* [[Library of Congress Classification:Class Q -- Science#QA - Mathematics|Subclass QA]] – [[Outline of mathematics|Mathematics]]
* [[Library of Congress Classification:Class Q -- Science#QB - Astronomy|Subclass QB]] – [[Outline of astronomy|Astronomy]]
* [[Library of Congress Classification:Class Q -- Science#QC - Physics|Subclass QC]] – [[Outline of physics|Physics]]
* [[Library of Congress Classification:Class Q -- Science#QD - Chemistry|Subclass QD]] – [[Outline of chemistry|Chemistry]]
* [[Library of Congress Classification:Class Q -- Science#QE - Geology|Subclass QE]] – [[Outline of geology|Geology]]
* [[Library of Congress Classification:Class Q -- Science#QH - Natural history - Biology|Subclass QH]] – [[Natural history]] – [[Outline of biology|Biology]]
* [[Library of Congress Classification:Class Q -- Science#QK - Botany|Subclass QK]] – [[Outline of botany|Botany]]
* [[Library of Congress Classification:Class Q -- Science#QL - Zoology|Subclass QL]] – [[Outline of zoology|Zoology]]
* [[Library of Congress Classification:Class Q -- Science#QM - Human anatomy|Subclass QM]] – [[Outline of human anatomy|Human anatomy]]
* [[Library of Congress Classification:Class Q -- Science#QP - Physiology|Subclass QP]] – [[Outline of physiology|Physiology]]
* [[Library of Congress Classification:Class Q -- Science#QR - Microbiology|Subclass QR]] – [[Microbiology]]

=== Class R – Medicine ===
{{Main|Library of Congress Classification:Class R -- Medicine}}
* [[Library of Congress Classification:Class R -- Medicine#R - Medicine (General)|Subclass R]] – [[Outline of medicine|Medicine]] (General)
* [[Library of Congress Classification:Class R -- Medicine#RA - Public aspects of medicine|Subclass RA]] – Public aspects of medicine
* [[Library of Congress Classification:Class R -- Medicine#RB - Pathology|Subclass RB]] – [[Pathology]]
* [[Library of Congress Classification:Class R -- Medicine#RC - Internal medicine|Subclass RC]] – [[Internal medicine]]
* [[Library of Congress Classification:Class R -- Medicine#RD - Surgery|Subclass RD]] – [[Surgery]]
* [[Library of Congress Classification:Class R -- Medicine#RE - Ophthalmology|Subclass RE]] – [[Ophthalmology]]
* [[Library of Congress Classification:Class R -- Medicine#RF - Otorhinolaryngology|Subclass RF]] – [[Otorhinolaryngology]]
* [[Library of Congress Classification:Class R -- Medicine#RG - Gynaecology and Obstetrics|Subclass RG]] – [[Gynecology]] and [[Outline of obstetrics|Obstetrics]]
* [[Library of Congress Classification:Class R -- Medicine#RJ - Pediatrics|Subclass RJ]] – [[Pediatrics]]
* [[Library of Congress Classification:Class R -- Medicine#RK - Dentistry|Subclass RK]] – [[Outline of dentistry|Dentistry]]
* [[Library of Congress Classification:Class R -- Medicine#RL - Dermatology|Subclass RL]] – [[Dermatology]]
* [[Library of Congress Classification:Class R -- Medicine#RM - Therapy. Pharmacology|Subclass RM]] – [[Therapeutics]]. [[Pharmacology]]
* [[Library of Congress Classification:Class R -- Medicine#RS - Pharmacy and materia medica|Subclass RS]] – [[Pharmacy]] and [[materia medica]]
* [[Library of Congress Classification:Class R -- Medicine#RT - Nursing|Subclass RT]] – [[Nursing]]
* [[Library of Congress Classification:Class R -- Medicine#RV - Botanic, Thomsonian, and eclectic medicine|Subclass RV]] – [[Herbalism|Botanic]], [[Thomsonian medicine|Thomsonian]], and [[Eclectic medicine]]
* [[Library of Congress Classification:Class R -- Medicine#RX - Homeopathy|Subclass RX]] – [[Homeopathy]]
* [[Library of Congress Classification:Class R -- Medicine#RZ - Other systems of medicine|Subclass RZ]] – Other systems of medicine

===Class S – Agriculture===
{{Main|Library of Congress Classification:Class S -- Agriculture}}
* [[Library of Congress Classification:Class S -- Agriculture#S - Agriculture (general)|Subclass S]] – [[Outline of agriculture|Agriculture]] (General)
* [[Library of Congress Classification:Class S -- Agriculture#SB - Plant culture|Subclass SB]] – [[Horticulture]]. [[Plant propagation]]. [[Plant breeding]]
* [[Library of Congress Classification:Class S -- Agriculture#SD - Forestry|Subclass SD]] – [[Outline of forestry|Forestry]]. [[Arboriculture]]. [[Silviculture]]
* [[Library of Congress Classification:Class S -- Agriculture#SF - Animal culture|Subclass SF]] – [[Animal husbandry]].  [[Animal science]]
* [[Library of Congress Classification:Class S -- Agriculture#SH - Aquaculture. Fishery. Angling|Subclass SH]] – [[Aquaculture]]. [[Outline of fisheries|Fisheries]]. [[Angling]]
* [[Library of Congress Classification:Class S -- Agriculture#SK - Hunting sports|Subclass SK]] – [[Hunting]]

===Class T – Technology===
{{Main|Library of Congress Classification:Class T -- Technology}}
* [[Library of Congress Classification:Class T -- Technology#T - Technology (general)|Subclass T]] – [[Outline of technology|Technology]] (General)
* [[Library of Congress Classification:Class T -- Technology#TA - Engineering (general). Civil engineering|Subclass TA]] – [[Outline of engineering|Engineering]] [[Civil engineering]] (General).
* [[Library of Congress Classification:Class T -- Technology#TC - Hydraulic engineering. Ocean engineering|Subclass TC]] – [[Hydraulic engineering]]. [[Offshore construction|Ocean engineering]]
* [[Library of Congress Classification:Class T -- Technology#TD - Environmental technology. Sanitary engineering|Subclass TD]] – [[Environmental engineering|Environmental technology]]. [[Sanitary engineering]]
* [[Library of Congress Classification:Class T -- Technology#TE - Highway engineering. Roads and pavements|Subclass TE]] – [[Highway engineering]]. Roads and pavements
* [[Library of Congress Classification:Class T -- Technology#TF - Railroad engineering and operation|Subclass TF]] – [[Railroad engineering]] and operation
* [[Library of Congress Classification:Class T -- Technology#TG - Bridge engineering|Subclass TG]] – [[Bridge]]s
* [[Library of Congress Classification:Class T -- Technology#TH - Building construction|Subclass TH]] – [[Outline of construction|Building construction]]
* [[Library of Congress Classification:Class T -- Technology#TJ - Mechanical engineering and machinery|Subclass TJ]] – [[Mechanical engineering]] and machinery
* [[Library of Congress Classification:Class T -- Technology#TK - Electrical engineering. Electronics. Nuclear engineering|Subclass TK]] – [[Electrical engineering]]. [[Electronics]]. [[Nuclear engineering]]
* [[Library of Congress Classification:Class T -- Technology#TL - Motor vehicles. Aeronautics. Astronautics|Subclass TL]] – [[Motor vehicles]]. [[Aeronautics]]. [[Astronautics]]
* [[Library of Congress Classification:Class T -- Technology#TN - Mining engineering. Metallurgy|Subclass TN]] – [[Outline of mining|Mining engineering]]. [[Metallurgy]]
* [[Library of Congress Classification:Class T -- Technology#TP - Chemical technology|Subclass TP]] – [[Chemical technology]]
* [[Library of Congress Classification:Class T -- Technology#TR - Photography|Subclass TR]] – [[Outline of photography|Photography]]
* [[Library of Congress Classification:Class T -- Technology#TS - Manufactures|Subclass TS]] – [[Manufacturing engineering]]. [[Mass production]]
* [[Library of Congress Classification:Class T -- Technology#TT - Handicrafts. Arts and crafts|Subclass TT]] – [[Outline of crafts|Handicrafts]]. [[Handicrafts|Arts and crafts]]
* [[Library of Congress Classification:Class T -- Technology#TX - Home economics|Subclass TX]] – [[Home economics]]

===Class U – Military Science===
{{Main|Library of Congress Classification:Class U -- Military Science}}
* [[Library of Congress Classification:Class U -- Military Science#U - Military science (general)|Subclass U]] – [[Outline of military science and technology|Military science]] (General)
* [[Library of Congress Classification:Class U -- Military Science#UA - Armies: Organization, distribution, military situation|Subclass UA]] – [[Army|Armies]]: [[Military organization|Organization]], distribution, military situation
* [[Library of Congress Classification:Class U -- Military Science#UB - Military administration|Subclass UB]] – Military administration
* [[Library of Congress Classification:Class U -- Military Science#UC - Maintenance and transportation|Subclass UC]] – Military maintenance and transportation
* [[Library of Congress Classification:Class U -- Military Science#UD - Infantry|Subclass UD]] – [[Infantry]]
* [[Library of Congress Classification:Class U -- Military Science#UE - Cavalry. Armour|Subclass UE]] – [[Cavalry]]. [[Armor]]
* [[Library of Congress Classification:Class U -- Military Science#UF - Artillery|Subclass UF]] – [[Artillery]]
* [[Library of Congress Classification:Class U -- Military Science#UG - Military engineering. Air forces|Subclass UG]] – [[Military engineering]]. Air forces
* [[Library of Congress Classification:Class U -- Military Science#UH - Other services|Subclass UH]] – Other military services

===Class V – Naval Science===
{{Main|Library of Congress Classification:Class V -- Naval Science}}
* [[Library of Congress Classification:Class V -- Naval Science#V - Naval science (General)|Subclass V]] – Naval science (General)
* [[Library of Congress Classification:Class V -- Naval Science#VA - Navies: Organization, distribution, naval situation|Subclass VA]] – [[Navy|Navies]]: Organization, distribution, naval situation
* [[Library of Congress Classification:Class V -- Naval Science#VB - Naval administration|Subclass VB]] – Naval administration
* [[Library of Congress Classification:Class V -- Naval Science#VC - Naval maintenance|Subclass VC]] – Naval maintenance
* [[Library of Congress Classification:Class V -- Naval Science#VD - Naval seaman|Subclass VD]] – Naval seamen
* [[Library of Congress Classification:Class V -- Naval Science#VE - Marines|Subclass VE]] – [[Marine (military)|Marines]]
* [[Library of Congress Classification:Class V -- Naval Science#VF - Naval ordnance|Subclass VF]] – Naval ordnance
* [[Library of Congress Classification:Class V -- Naval Science#VG - Minor services of navies|Subclass VG]] – Minor services of navies
* [[Library of Congress Classification:Class V -- Naval Science#VK  -Navigation. Merchant marine|Subclass VK]] – [[Navigation]]. [[Merchant marine]]
* [[Library of Congress Classification:Class V -- Naval Science#VM - Naval architecture. Shipbuilding. Marine engineering|Subclass VM]] – [[Naval architecture]]. [[Shipbuilding]]. [[Marine propulsion|Marine engineering]]

===Class Z – Bibliography, Library Science===
{{Main|Library of Congress Classification:Class Z -- Bibliography. Library Science. Information resources}}
* [[Library of Congress Classification:Class Z -- Bibliography. Library Science. Information resources#Z - Books (general). Writing. Palaeography. Book Industries and trade. Libraries. Bibliography|Subclass Z]] – Books (General). Writing. Paleography. Book industries and trade. Libraries. Bibliography
* [[Library of Congress Classification:Class Z -- Bibliography. Library Science. Information resources#ZA - Information Resources (General)|Subclass ZA]] – Information resources/materials

==See also==<!-- Please respect alphabetical order -->
* [[ACM Computing Classification System]]
* [[Books in the United States]]
* [[Brinkler classification]]
* [[Chinese Library Classification]]
* [[Database of Recorded American Music]]
* [[Dewey Decimal Classification]]
** [[Comparison of Dewey and Library of Congress subject classification]]
* [[Harvard–Yenching Classification]]
* [[Moys Classification Scheme]]
* [[ISBN]]
* [[Minnie Earl Sears]], formulated Sears Subject Headings, simplified for use by small libraries

==Notes==
{{reflist |group=lower-alpha |refs=

<ref group=lower-alpha name=authors>
LCCN also covers authors, which LCC does not. For authors (people), the letter 'n' accompanies the number, and they too define URLs in a parallel catalog, such as "n83160096" and "http://lccn.loc.gov/n83160096 ". (So LCCN may be called alphanumeric.)</ref>
<ref group=lower-alpha name=subjects>
LCSH too is developed by the Library and assigns alphanumeric IDs. A closer look at this example shows refinements defined in 2004, 2007, and 2009. [http://id.loc.gov/search/?q=Boarding+schools&q=cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fauthorities%2Fsubjects LCSH: Boarding schools].<!-- See Talk
 --><!--
 http://id.loc.gov/search/?q=Boarding+schools&q=cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fauthorities%2Fsubjects (example Subject Headings identifiers and labels that seem to exhibit development
 identifier    label
 sh85015136    Boarding schools
 sh2004006485  Boarding schools in literature
 sh2007102067  Boarding schools—Fiction
 sh2009116962  Boarding schools—Juvenile fiction
--></ref>
}}

==References==
{{Reflist}}

== External links ==
{{Wikisource}}
{{Wikidata property|P1149}}
* "[https://www.loc.gov/catdir/cpso/lcco/ Library of Congress classification outline]", LOC
* "[http://www.loc.gov/aba/publications/FreeLCC/freelcc.html Library of Congress Classification PDF Files]", LOC
* "[https://www.loc.gov/aba/cataloging/classification/ Classification]", LOC
* "[https://www.loc.gov/cds/ Cataloging Distribution Services]" – Library of Congress
* "[https://www.loc.gov/catdir/cpso/lcco/lcco.html Classification outline]", LOC
* [https://web.archive.org/web/20140412225645/http://geography.about.com/library/congress/blhowto.htm How to read LCC call numbers], geography.about.com (via The [[Wayback Machine]])
* [http://www.zackgrossbart.com/hackito/the-library-problem/ How to use LCC to organize a home library], zackgrossbart.com
<!-- official site : [http://lcsh.info/ icsh.info] -->

{{-}}
{{Library classification systems}}

{{Authority control}}

[[Category:Library of Congress Classification| ]]