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Library of Congress Subject Areas (21199)
- A General Works (14)
  - AC Collections. Series. Collected works (6)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (6)
- B Philosophy. Psychology. Religion (2000)
  - B Philosophy (General) (146)
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    - BV1460 Religious Education (4)
- C Auxiliary Sciences of History (29)
  - C Auxiliary sciences of history (General) (5)
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- D History General and Old World (285)
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- E History America (15)
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- F History United States, Canada, Latin America (5)
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- G Geography. Anthropology. Recreation (1266)
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- H Social Sciences (5779)
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- J Political Science (277)
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- K Law (957)
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- L Education (1824)
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- M Music and Books on Music (198)
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- N Fine Arts (948)
  - N Visual arts (General) For photography, see TR (412)
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- P Language and Literature (941)
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- Q Science (5714)
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- R Medicine (2628)
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  - RA Public aspects of medicine (742)
    - RA0421 Public health. Hygiene. Preventive Medicine (445)
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  - RB Pathology (55)
  - RC Internal medicine (386)
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    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (124)
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  - RK Dentistry (64)
  - RL Dermatology (12)
  - RM Therapeutics. Pharmacology (194)
  - RS Pharmacy and materia medica (320)
  - RT Nursing (434)
  - RV Botanic, Thomsonian, and eclectic medicine (27)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (68)
- S Agriculture (2291)
  - S Agriculture (General) (1885)
  - SB Plant culture (567)
  - SD Forestry (56)
  - SF Animal culture (108)
  - SH Aquaculture. Fisheries. Angling (78)
- T Technology (3547)
  - T Technology (General) (1029)
    - T201 Patents. Trademarks (5)
  - TA Engineering (General). Civil engineering (General) (1147)
  - TC Hydraulic engineering. Ocean engineering (28)
  - TD Environmental technology. Sanitary engineering (245)
  - TE Highway engineering. Roads and pavements (11)
  - TF Railroad engineering and operation (15)
  - TG Bridge engineering (7)
  - TH Building construction (255)
  - TJ Mechanical engineering and machinery (253)
  - TK Electrical engineering. Electronics Nuclear engineering (640)
  - TL Motor vehicles. Aeronautics. Astronautics (100)
  - TN Mining engineering. Metallurgy (97)
  - TP Chemical technology (197)
  - TR Photography (32)
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  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (21)
- U Military Science (15)
  - U Military Science (General) (15)
- V Naval Science (75)
  - V Naval Science (General) (23)
  - VM Naval architecture. Shipbuilding. Marine engineering (54)
- Z Bibliography. Library Science. Information Resources (171)
  - Z004 Books. Writing. Paleography (77)
  - Z665 Library Science. Information Science (31)
  - Z719 Libraries (General) (8)
  - ZA Information resources (59)
    - ZA4050 Electronic information resources (18)
    - ZA4450 Databases (5)