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Library of Congress Subject Areas (15352)
- A General Works (7)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1636)
  - B Philosophy (General) (22)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (147)
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- E History America (25)
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- F History United States, Canada, Latin America (26)
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- G Geography. Anthropology. Recreation (320)
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- H Social Sciences (4672)
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  - HB Economic Theory (670)
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- J Political Science (719)
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- K Law (615)
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- L Education (316)
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  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (489)
  - M Music (291)
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- N Fine Arts (117)
  - N Visual arts (General) For photography, see TR (21)
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- P Language and Literature (833)
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- Q Science (2915)
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  - QH Natural history (95)
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- R Medicine (3533)
  - R Medicine (General) (204)
  - RA Public aspects of medicine (797)
    - RA0421 Public health. Hygiene. Preventive Medicine (299)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (4)
  - RC Internal medicine (1129)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (63)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (531)
    - RC1200 Sports Medicine (1)
  - RD Surgery (20)
  - RE Ophthalmology (514)
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    - RJ101 Child Health. Child health services (75)
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  - RT Nursing (402)
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- S Agriculture (60)
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- T Technology (2399)
  - T Technology (General) (115)
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  - TA Engineering (General). Civil engineering (General) (1061)
  - TC Hydraulic engineering. Ocean engineering (46)
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  - TH Building construction (64)
  - TJ Mechanical engineering and machinery (404)
  - TK Electrical engineering. Electronics Nuclear engineering (583)
  - TL Motor vehicles. Aeronautics. Astronautics (220)
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  - TP Chemical technology (4)
  - TR Photography (6)
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  - TX Home economics (38)
- U Military Science (22)
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- V Naval Science (10)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (718)
  - Z665 Library Science. Information Science (626)
  - Z719 Libraries (General) (11)
  - ZA Information resources (86)
    - ZA4050 Electronic information resources (68)
    - ZA4450 Databases (10)