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Library of Congress Subject Areas (16276)
- A General Works (9)
  - AC Collections. Series. Collected works (1)
  - AI Indexes (General) (3)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (2)
- B Philosophy. Psychology. Religion (1936)
  - B Philosophy (General) (322)
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- C Auxiliary Sciences of History (35)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (1)
  - CC Archaeology (3)
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    - CD921 Archives (22)
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- D History General and Old World (593)
  - D History (General) (434)
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- E History America (65)
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- F History United States, Canada, Latin America (58)
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- G Geography. Anthropology. Recreation (399)
  - G Geography (General) (24)
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  - GV Recreation Leisure (69)
    - GV557 Sport (17)
- H Social Sciences (5877)
  - H Social Sciences (General) (1721)
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- J Political Science (1546)
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- K Law (1050)
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- L Education (268)
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- M Music and Books on Music (24)
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- N Fine Arts (196)
  - N Visual arts (General) For photography, see TR (57)
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- P Language and Literature (1338)
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  - PN Literature (General) (357)
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    - PN2000 Dramatic representation. The Theater (67)
  - PQ Romance literatures (3)
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- Q Science (3985)
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- R Medicine (1409)
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    - RA790 Mental Health (91)
  - RB Pathology (8)
  - RC Internal medicine (590)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (124)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (179)
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  - RD Surgery (4)
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  - RM Therapeutics. Pharmacology (18)
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  - RT Nursing (38)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (5)
- S Agriculture (61)
  - S Agriculture (General) (41)
  - SB Plant culture (5)
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  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (14)
- T Technology (324)
  - T Technology (General) (56)
  - TA Engineering (General). Civil engineering (General) (3)
  - TD Environmental technology. Sanitary engineering (2)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (236)
  - TL Motor vehicles. Aeronautics. Astronautics (8)
  - TR Photography (21)
- U Military Science (24)
  - U Military Science (General) (24)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (83)
  - Z004 Books. Writing. Paleography (18)
  - Z665 Library Science. Information Science (6)
  - Z719 Libraries (General) (2)
  - ZA Information resources (60)
    - ZA4050 Electronic information resources (51)
    - ZA4450 Databases (5)