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Library of Congress Subject Areas (8557)
- A General Works (11)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (2)
  - AZ History of Scholarship The Humanities (7)
- B Philosophy. Psychology. Religion (604)
  - B Philosophy (General) (81)
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- C Auxiliary Sciences of History (16)
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- D History General and Old World (77)
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- E History America (1)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (782)
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- H Social Sciences (2523)
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- J Political Science (315)
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- K Law (264)
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- L Education (1175)
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- M Music and Books on Music (28)
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- N Fine Arts (50)
  - N Visual arts (General) For photography, see TR (7)
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- P Language and Literature (250)
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- Q Science (2185)
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- R Medicine (2402)
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  - RA Public aspects of medicine (1616)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (133)
  - RB Pathology (42)
  - RC Internal medicine (95)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (23)
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  - RV Botanic, Thomsonian, and eclectic medicine (14)
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- S Agriculture (649)
  - S Agriculture (General) (482)
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- T Technology (849)
  - T Technology (General) (424)
  - TA Engineering (General). Civil engineering (General) (246)
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  - TH Building construction (52)
  - TJ Mechanical engineering and machinery (83)
  - TK Electrical engineering. Electronics Nuclear engineering (83)
  - TL Motor vehicles. Aeronautics. Astronautics (36)
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  - TP Chemical technology (58)
  - TR Photography (5)
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  - TX Home economics (55)
- U Military Science (9)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (185)
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  - Z719 Libraries (General) (14)
  - ZA Information resources (130)
    - ZA4050 Electronic information resources (58)
    - ZA4450 Databases (8)