Library of Congress Classification System
Classes And Subclasses
Use this table to decipher the two- and three-letter codes that call numbers begin with.
To locate the classification letters for specific keywords, try searching the Keyword Guide.
| A: GENERAL WORKS |
| AC |
Collections. Series. Collected works |
| AE |
Encyclopedias (General) |
| AG |
Dictionaries; general reference books |
| AI |
Indexes (General) |
| AM |
Museums |
| AN |
Newspapers |
| AP |
Periodicals (General) |
| AS |
Academics and learned societies (General) |
| AY |
Yearbooks. Almanacs. Directories |
| AZ |
History of scholarship and learning. The humanities; Popular errors, delusions, superstitutions |
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| B: Philosophy, Psychology, Religion |
| B |
Philosophy (General) |
| BC |
Logic |
| BD |
Speculative Philosophy |
| BF |
Psychology |
| BH |
Aesthetics |
| BJ |
Ethics. Social Usages. Etiquette |
| BL |
Religions. Mythology. Rationalism |
| BM |
Judaism |
| BP |
Islam. Bahaism. Theosophy, etc. |
| BQ |
Buddhism |
| BR |
Christianity |
| BS |
The Bible |
| BT |
Doctrinal theology |
| BV |
Practical theology |
| BX |
Christian denominations |
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| C: Auxiliary Sciences of History |
| C |
Auxiliary sciences of history (General) |
| CB |
History of civilization |
| CC |
Archaeology (General) |
| CD |
Diplomatics. Archives. Seals |
| CE |
Technical chronology. Calendar |
| CJ |
Numismatics |
| CN |
Inscriptions. Epigraphy |
| CR |
Heraldry |
| CS |
Genealogy |
| CT |
Biography |
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| D: History: General and Old World |
| D |
History (General) |
| DA |
Great Britain |
| DB |
Austria. Liechtenstein. Hungary. Czechoslovakia |
| DC |
France. Andorra. Monaco |
| DD |
Germany |
| DE |
The Mediterranean. Greco-Roman World |
| DF |
Greece |
| DG |
Italy |
| DH |
Netherlands (Holland) |
| DJK |
Eastern Europe |
| DK |
Soviet Union |
| DL |
Northern Europs. Scandinavia |
| DP |
Spain. Portugal |
| DQ |
Switzerland |
| DR |
Balkan Peninsula |
| DS |
Asia |
| DT |
Africa |
| DU |
Oceania (South Seas) |
| DX |
Gypsies |
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| E - F History: America |
| E 11-29 |
America (General) |
| E 31-46 |
North America |
| E 51-99 |
Indians. Indians of North America |
| E 101-135 |
Discovery of North America. Early Explorations |
| E 151 |
United States (General) |
| E 184-185.98 |
Elements in the population |
| E 184.5-185.98 |
African-Americans |
| E 186-199 |
Colonial History |
| E 201-298 |
Revolution |
| E 301-453 |
Revolution to the Civil War |
| E 351-364.9 |
War of 1812 |
| E 401-415.2 |
War with Mexico |
| E 441-453 |
Slavery |
| E 456-655 |
Civil War |
| E 482-489 |
Confederate States of America |
| E 600-738 |
Late nineteenth century |
| E 714-735 |
Spanish-American War |
| E 740- |
Twentieth Century |
| F 1-975 |
United States local history |
| F 1001-1140 |
British America. Canada |
| F 1202-2191 |
Mexico. Latin America. Central America. West Indies |
| F 2201-3799 |
South America |
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| G: Geography (General) Atlases, Maps |
| GA |
Mathematical geography. Cartography |
| GB |
Physical geography |
| GC |
Oceanography |
| GF |
Human Ecology. Anthropogeography |
| GN |
Anthropology |
| GR |
Folklore |
| GT |
Manners and customs (General) |
| GV |
Recreation. Leisure |
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| H: Social Sciences |
| H |
Social Sciences (General) |
| HA |
Statistics |
| HB |
Economic Theory. Demography |
| HC-HD |
Economic history and conditions |
| HE |
Transportation and communication |
| HF |
Commerce |
| HG |
Finance |
| HJ |
Public Finance |
| HM |
Sociology (general and theoretical) |
| HN |
Social history/problems/reform |
| HQ |
The family. Marriage. Women |
| HS |
Societies: secret, benevolent, etc. Clubs |
| HT |
Communities. Classes. Races |
| HV |
Social pathology/public welfare. Criminology |
| HX |
Socialism. Communism. Anarchism |
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| J: Political Science |
| J |
General legislative and executive papers |
| JA |
Collections and general works |
| JC |
Political theory |
| JF |
General works |
| JK |
United States |
| JL |
British America. Latin America |
| JN |
Europe |
| JQ |
Asia. Africa. Australia. Oceania |
| JS |
Local government |
| JV |
Colonies and colonization. Emigration and immigration |
| JX |
Interntional law. International relations |
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| K: Law |
| K 1-7720 |
Law (General) |
| KDZ 0-4999 |
America. North America |
| KF |
Hazardous waste regulation |
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| L: Education |
| L |
Education (General) |
| LA |
History of Education |
| LB |
Theory and Practice of Education
(LB 1140-1602: Early Childhood Education) |
| LC |
Special Aspects of Education |
| LD |
Schools: United States |
| LE |
Schools: America, except United States |
| LF |
Schools: Europe |
| LG |
Schools: Asia. Africa. Oceania |
| LH |
College and school magazines and papers |
| LJ |
Student fraternities and societies, U.S. |
| LT |
Textbooks |
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| M: Music and Books on Music |
| M |
Music (General) |
| ML |
Literature of Music |
| MT |
Musical instruction and study |
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| N: Fine Arts |
| N |
Visual Arts |
| NA |
Architecture |
| NB |
Sculpture |
| NC |
Drawing. Design. Illustration |
| ND |
Painting |
| NE |
Print media |
| NK |
Decorative and applied arts. Decoration and ornament |
| NX |
Arts in general |
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| P: Language and Literature |
| P |
Philology and linguistics (General) |
| PA |
Classical languages and literatures |
| PB |
Modern European languages |
| PC |
Romance languages |
| PD |
Germanic languages |
| PE |
English |
| PF-PM |
Other languages |
| PN |
Literature |
| PQ |
Romance literatures |
| PR |
English literature |
| PS |
American literature |
| PT |
Germanic literature |
| PZ |
Juvenile literature |
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| Q: Science |
| Q |
Science (General) |
| QA |
Mathematics |
| QB |
Astronomy |
| QC |
Physics |
| QD |
Chemistry |
| QE |
Geology |
| QH |
Natural History (General) Biology (General) |
| QK |
Botany |
| QL |
Zoology |
| QM |
Human anatomy |
| QP |
Physiology |
| QR |
Microbiology |
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| R: Medicine |
| R |
Medicine (General) |
| RA |
Public Aspects of Medicine |
| RB |
Pathology |
| RC |
Internal medicine |
| RD |
Surgery |
| RE |
Opthamology |
| RF |
Otorhinolaryngology |
| RG |
Gynecology and obstetrics |
| RJ |
Pediatrics |
| RK |
Dentistry |
| RL |
Dermatology |
| RM |
Therapeutics. Pharmacology |
| RS |
Pharmacy and materia medica |
| RT |
Nursing |
| RV |
Botanic, Thomsonian, and eclectic medicine |
| RX |
Homeopathy |
| RZ |
Other systems of medicine |
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| S: Agriculture |
| S |
Agriculture (General) |
| SB |
Plant culture
(317.5-450.87: Horticulture) |
| SD |
Forestry |
| SF |
Animal Culture |
| SH |
Aquaculture. Fisheries. Angling |
| SK |
Hunting |
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| T: Technology |
| T |
Technology (General) |
| TA |
Engineering (General). Civil engineering (General) |
| TC |
Hydraulic engineering |
| TD |
Environmental technology. Sanitary engineering |
| TE |
Highway engineering. Roads and pavements |
| TF |
Railroad engineering and operation |
| TG |
Bridge engineering |
| TH |
Building construction |
| TJ |
Mechanical engineering and machinery |
| TK |
Electrical engineering. Electronics. Nuclear engineering |
| TL |
Motor vehicles. Aeronautics. Astronautics |
| TN |
Mining engineering. Metallurgy |
| TP |
Chemical technology |
| TR |
Photography |
| TS |
Manufactures |
| TT |
Handicrafts. Arts and crafts |
| TX |
Home economics
(TD341-840: Nutrition through Cookery)
|
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| U: Military Science |
| U |
Military Science (General) |
| UA |
Armies: Organization, description, facilities, etc. |
| UB |
Military adminiatration |
| UC |
Maintenance and transportation |
| UD |
Infantry |
| UE |
Cavalry. Armored and mechanized cavalry |
| UF |
Artillery |
| UG |
Military engineering. Air forces. Air warfare |
| UH |
Other services |
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| V: Naval Science |
| V |
Naval Science (General) |
| VA |
Navies: Organization, description, facilities. etc. |
| VB |
Naval administration |
| VC |
Naval maintenance |
| VD |
Naval seamen |
| VE |
Marines |
| VF |
Naval ordnance |
| VG |
Minor services of navies |
| VK |
Navigation. Merchant marine |
| VM |
Naval architecture. Shipbuilding. Marine engineering
(VM975-989: Diving) |
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