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Library of Congress Subject Areas (15894)
- 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 (1884)
  - B Philosophy (General) (315)
  - BC Logic (1)
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  - BV Practical Theology (2)
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- C Auxiliary Sciences of History (34)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (1)
  - CC Archaeology (3)
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    - CD921 Archives (21)
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- D History General and Old World (583)
  - D History (General) (426)
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- E History America (65)
  - E11 America (General) (26)
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- F History United States, Canada, Latin America (58)
  - F001 United States local history (8)
  - F1001 Canada (General) (2)
  - F1201 Latin America (General) (50)
- G Geography. Anthropology. Recreation (393)
  - G Geography (General) (24)
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  - GC Oceanography (80)
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  - GV Recreation Leisure (66)
    - GV557 Sport (15)
- H Social Sciences (5762)
  - H Social Sciences (General) (1697)
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  - HQ The family. Marriage. Women (175)
- J Political Science (1515)
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- K Law (1021)
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- L Education (261)
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- M Music and Books on Music (24)
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- N Fine Arts (194)
  - N Visual arts (General) For photography, see TR (57)
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  - NX Arts in general (92)
- P Language and Literature (1319)
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  - PN Literature (General) (351)
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    - PN2000 Dramatic representation. The Theater (67)
  - PQ Romance literatures (3)
  - PR English literature (80)
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- Q Science (3861)
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    - QA75 Electronic computers. Computer science (1999)
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  - QC Physics (147)
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  - QH Natural history (1116)
    - QH301 Biology (860)
    - QH426 Genetics (276)
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- R Medicine (1371)
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  - RA Public aspects of medicine (201)
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    - RA790 Mental Health (84)
  - RB Pathology (8)
  - RC Internal medicine (574)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (122)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (173)
    - RC0500 Psychoanalysis (117)
    - RC1200 Sports Medicine (157)
  - RD Surgery (4)
  - RE Ophthalmology (66)
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  - RG Gynecology and obstetrics (20)
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    - RJ101 Child Health. Child health services (30)
  - RK Dentistry (4)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (18)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (37)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (5)
- S Agriculture (60)
  - S Agriculture (General) (40)
  - SB Plant culture (5)
  - SD Forestry (2)
  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (14)
- T Technology (322)
  - T Technology (General) (56)
  - TA Engineering (General). Civil engineering (General) (3)
  - TD Environmental technology. Sanitary engineering (1)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (235)
  - 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 (78)
  - Z004 Books. Writing. Paleography (18)
  - Z665 Library Science. Information Science (6)
  - Z719 Libraries (General) (2)
  - ZA Information resources (55)
    - ZA4050 Electronic information resources (47)
    - ZA4450 Databases (5)