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Library of Congress Subject Areas (16381)
- 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 (1941)
  - B Philosophy (General) (326)
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- C Auxiliary Sciences of History (41)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (1)
  - CC Archaeology (9)
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    - CD921 Archives (22)
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- D History General and Old World (596)
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- E History America (65)
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- F History United States, Canada, Latin America (59)
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- G Geography. Anthropology. Recreation (403)
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- H Social Sciences (5913)
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- J Political Science (1566)
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- K Law (1056)
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- L Education (269)
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- M Music and Books on Music (24)
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- N Fine Arts (199)
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- P Language and Literature (1347)
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    - PN2000 Dramatic representation. The Theater (68)
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- Q Science (4011)
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- R Medicine (1417)
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  - RA Public aspects of medicine (215)
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    - RA790 Mental Health (94)
  - RB Pathology (8)
  - RC Internal medicine (592)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (125)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (179)
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  - RM Therapeutics. Pharmacology (18)
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  - RX Homeopathy (2)
  - RZ Other systems of medicine (5)
- S Agriculture (62)
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  - SH Aquaculture. Fisheries. Angling (14)
- T Technology (326)
  - T Technology (General) (57)
  - TA Engineering (General). Civil engineering (General) (5)
  - 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 (9)
  - TR Photography (21)
- U Military Science (23)
  - U Military Science (General) (23)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (86)
  - Z004 Books. Writing. Paleography (18)
  - Z665 Library Science. Information Science (6)
  - Z719 Libraries (General) (2)
  - ZA Information resources (63)
    - ZA4050 Electronic information resources (53)
    - ZA4450 Databases (5)