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Library of Congress Subject Areas (17020)
- 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 (1883)
  - B Philosophy (General) (28)
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- C Auxiliary Sciences of History (6)
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- D History General and Old World (179)
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- E History America (25)
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- F History United States, Canada, Latin America (32)
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- G Geography. Anthropology. Recreation (414)
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- H Social Sciences (5325)
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- J Political Science (853)
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- L Education (365)
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- M Music and Books on Music (529)
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- N Fine Arts (134)
  - N Visual arts (General) For photography, see TR (22)
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- P Language and Literature (909)
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- Q Science (3305)
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- R Medicine (4129)
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  - RB Pathology (8)
  - RC Internal medicine (1375)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (82)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (669)
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- S Agriculture (67)
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- T Technology (2682)
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  - TA Engineering (General). Civil engineering (General) (1155)
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  - TH Building construction (67)
  - TJ Mechanical engineering and machinery (478)
  - TK Electrical engineering. Electronics Nuclear engineering (658)
  - TL Motor vehicles. Aeronautics. Astronautics (274)
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  - TR Photography (6)
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  - TX Home economics (56)
- U Military Science (24)
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- V Naval Science (16)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (758)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (660)
  - Z719 Libraries (General) (11)
  - ZA Information resources (90)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)