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Library of Congress Subject Areas (39988)
- A General Works (90)
  - AC Collections. Series. Collected works (49)
  - AI Indexes (General) (15)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (26)
- B Philosophy. Psychology. Religion (7)
  - B Philosophy (General) (1)
  - BF Psychology (4)
  - BL Religion (1)
  - BP Islam. Bahaism. Theosophy, etc (2)
- D History General and Old World (4)
  - DA Great Britain (1)
    - DAW Central Europe (1)
  - DK Russia. Soviet Union. Former Soviet Republics (1)
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  - DS Asia (1)
- E History America (3)
  - E11 America (General) (1)
  - E151 United States (General) (2)
- F History United States, Canada, Latin America (1)
  - F1201 Latin America (General) (1)
- G Geography. Anthropology. Recreation (218)
  - G Geography (General) (91)
  - GA Mathematical geography. Cartography (3)
  - GB Physical geography (60)
  - GE Environmental Sciences (69)
  - GT Manners and customs (2)
  - GV Recreation Leisure (15)
- H Social Sciences (16430)
  - H Social Sciences (General) (7117)
  - HA Statistics (16)
  - HB Economic Theory (2395)
  - HC Economic History and Conditions (674)
  - HD Industries. Land use. Labor (3009)
    - HD28 Management. Industrial Management (2189)
    - HD61 Risk Management (85)
  - HE Transportation and Communications (487)
  - HF Commerce (1097)
    - HF5601 Accounting (561)
  - HG Finance (1429)
  - HJ Public Finance (665)
  - HM Sociology (43)
  - HN Social history and conditions. Social problems. Social reform (244)
  - HQ The family. Marriage. Woman (22)
  - HS Societies secret benevolent etc (4)
  - HT Communities. Classes. Races (32)
  - HV Social pathology. Social and public welfare (27)
  - HX Socialism. Communism. Anarchism (8)
- J Political Science (1468)
  - J General legislative and executive papers (18)
  - JA Political science (General) (158)
  - JC Political theory (39)
  - JF Political institutions (General) (107)
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  - JN Political institutions (Europe) (21)
    - JN101 Great Britain (1)
  - JQ Political institutions Asia (63)
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  - JV Colonies and colonization. Emigration and immigration. International migration (9)
  - JX International law (73)
  - JZ International relations (1010)
- K Law (14)
  - K Law (General) (13)
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- L Education (170)
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    - LC5201 Education extension. Adult education. Continuing education (1)
  - LD Individual institutions (United States) (1)
  - LE Individual institutions (America except United States) (1)
  - LG Individual institutions (Asia. Africa) (4)
  - LT Textbooks (5)
- M Music and Books on Music (4)
  - M Music (4)
  - ML Literature of music (1)
  - MT Musical instruction and study (1)
- N Fine Arts (49)
  - N Visual arts (General) For photography, see TR (24)
  - NC Drawing Design Illustration (4)
  - NE Print media (5)
  - NK Decorative arts Applied arts Decoration and ornament (1)
  - NX Arts in general (17)
- P Language and Literature (5)
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- Q Science (6951)
  - Q Science (General) (1556)
  - QA Mathematics (701)
    - QA75 Electronic computers. Computer science (547)
    - QA76 Computer software (223)
  - QC Physics (185)
  - QD Chemistry (1015)
  - QE Geology (3600)
  - QH Natural history (7)
    - QH301 Biology (4)
  - QK Botany (34)
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  - QR Microbiology (8)
    - QR355 Virology (1)
- R Medicine (19)
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  - RA Public aspects of medicine (5)
    - RA0421 Public health. Hygiene. Preventive Medicine (4)
  - RK Dentistry (1)
  - RS Pharmacy and materia medica (1)
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  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RZ Other systems of medicine (2)
- S Agriculture (3545)
  - S Agriculture (General) (3186)
  - SB Plant culture (443)
  - SD Forestry (16)
  - SF Animal culture (50)
  - SH Aquaculture. Fisheries. Angling (16)
- T Technology (11018)
  - T Technology (General) (3896)
    - T201 Patents. Trademarks (32)
  - TA Engineering (General). Civil engineering (General) (2711)
  - TC Hydraulic engineering. Ocean engineering (245)
  - TD Environmental technology. Sanitary engineering (860)
  - TE Highway engineering. Roads and pavements (8)
  - TF Railroad engineering and operation (6)
  - TG Bridge engineering (49)
  - TH Building construction (11)
  - TJ Mechanical engineering and machinery (100)
  - TK Electrical engineering. Electronics Nuclear engineering (213)
  - TL Motor vehicles. Aeronautics. Astronautics (3)
  - TN Mining engineering. Metallurgy (1975)
  - TP Chemical technology (969)
  - TR Photography (3)
  - TS Manufactures (445)
  - TT Handicrafts Arts and crafts (9)
  - TX Home economics (27)
- U Military Science (13)
  - U Military Science (General) (13)
- Z Bibliography. Library Science. Information Resources (884)
  - Z665 Library Science. Information Science (32)
  - Z719 Libraries (General) (4)
  - ZA Information resources (854)
    - ZA4050 Electronic information resources (114)
    - ZA4450 Databases (433)