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Library of Congress Subject Areas (19927)
- A General Works (8)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (2312)
  - B Philosophy (General) (37)
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- C Auxiliary Sciences of History (9)
  - C Auxiliary sciences of history (General) (1)
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    - CD921 Archives (3)
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- D History General and Old World (232)
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- E History America (27)
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- F History United States, Canada, Latin America (37)
  - F1001 Canada (General) (2)
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- G Geography. Anthropology. Recreation (519)
  - G Geography (General) (53)
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- H Social Sciences (6335)
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- J Political Science (1125)
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- K Law (875)
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- L Education (489)
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- M Music and Books on Music (597)
  - M Music (367)
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- N Fine Arts (148)
  - N Visual arts (General) For photography, see TR (22)
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- P Language and Literature (1054)
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- Q Science (3896)
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    - QA75 Electronic computers. Computer science (1849)
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  - QH Natural history (138)
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- R Medicine (5250)
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  - RA Public aspects of medicine (1597)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (8)
  - RC Internal medicine (1746)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (101)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (875)
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  - RD Surgery (24)
  - RE Ophthalmology (687)
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  - RJ Pediatrics (369)
    - RJ101 Child Health. Child health services (164)
  - RK Dentistry (3)
  - RL Dermatology (11)
  - RM Therapeutics. Pharmacology (57)
  - RS Pharmacy and materia medica (13)
  - RT Nursing (675)
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  - RZ Other systems of medicine (62)
- S Agriculture (87)
  - S Agriculture (General) (44)
  - SB Plant culture (12)
  - SD Forestry (1)
  - SF Animal culture (16)
- T Technology (3277)
  - T Technology (General) (198)
    - T201 Patents. Trademarks (2)
  - TA Engineering (General). Civil engineering (General) (1426)
  - TC Hydraulic engineering. Ocean engineering (58)
  - TD Environmental technology. Sanitary engineering (27)
  - TE Highway engineering. Roads and pavements (10)
  - TF Railroad engineering and operation (7)
  - TG Bridge engineering (27)
  - TH Building construction (173)
  - TJ Mechanical engineering and machinery (589)
  - TK Electrical engineering. Electronics Nuclear engineering (775)
  - TL Motor vehicles. Aeronautics. Astronautics (326)
  - TN Mining engineering. Metallurgy (5)
  - TP Chemical technology (7)
  - TR Photography (7)
  - TS Manufactures (6)
  - TX Home economics (79)
- U Military Science (35)
  - U Military Science (General) (5)
- V Naval Science (33)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (17)
- Z Bibliography. Library Science. Information Resources (798)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (690)
  - Z719 Libraries (General) (11)
  - ZA Information resources (97)
    - ZA4050 Electronic information resources (70)
    - ZA4450 Databases (10)