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Library of Congress Subject Areas (23614)
- A General Works (16)
  - AC Collections. Series. Collected works (7)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (7)
- B Philosophy. Psychology. Religion (2328)
  - B Philosophy (General) (153)
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    - BV1460 Religious Education (4)
- C Auxiliary Sciences of History (32)
  - C Auxiliary sciences of history (General) (7)
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- D History General and Old World (309)
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- E History America (18)
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- F History United States, Canada, Latin America (6)
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- G Geography. Anthropology. Recreation (1500)
  - G Geography (General) (72)
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- H Social Sciences (6883)
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- L Education (2214)
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- M Music and Books on Music (224)
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- N Fine Arts (1154)
  - N Visual arts (General) For photography, see TR (566)
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- P Language and Literature (1035)
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- Q Science (6544)
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- R Medicine (3005)
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  - RK Dentistry (65)
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  - RM Therapeutics. Pharmacology (199)
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  - RT Nursing (451)
  - RV Botanic, Thomsonian, and eclectic medicine (29)
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  - RZ Other systems of medicine (73)
- S Agriculture (2483)
  - S Agriculture (General) (2066)
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  - SH Aquaculture. Fisheries. Angling (88)
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- T Technology (3954)
  - T Technology (General) (1401)
    - T201 Patents. Trademarks (5)
  - TA Engineering (General). Civil engineering (General) (1171)
  - TC Hydraulic engineering. Ocean engineering (31)
  - TD Environmental technology. Sanitary engineering (254)
  - TE Highway engineering. Roads and pavements (14)
  - TF Railroad engineering and operation (16)
  - TG Bridge engineering (7)
  - TH Building construction (289)
  - TJ Mechanical engineering and machinery (266)
  - TK Electrical engineering. Electronics Nuclear engineering (674)
  - TL Motor vehicles. Aeronautics. Astronautics (107)
  - TN Mining engineering. Metallurgy (98)
  - TP Chemical technology (223)
  - TR Photography (40)
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  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (21)
- U Military Science (25)
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- V Naval Science (75)
  - V Naval Science (General) (23)
  - VM Naval architecture. Shipbuilding. Marine engineering (54)
- Z Bibliography. Library Science. Information Resources (180)
  - Z004 Books. Writing. Paleography (77)
  - Z665 Library Science. Information Science (34)
  - Z719 Libraries (General) (9)
  - ZA Information resources (64)
    - ZA4050 Electronic information resources (18)
    - ZA4450 Databases (7)