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Library of Congress Subject Areas (56607)
- A General Works (73)
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  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (46)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (4039)
  - B Philosophy (General) (167)
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- C Auxiliary Sciences of History (11)
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- E History America (1)
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- G Geography. Anthropology. Recreation (1110)
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- H Social Sciences (11462)
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- M Music and Books on Music (20)
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- N Fine Arts (606)
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- Q Science (3265)
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- R Medicine (8508)
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- S Agriculture (82)
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- T Technology (5119)
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  - TK Electrical engineering. Electronics Nuclear engineering (710)
  - TL Motor vehicles. Aeronautics. Astronautics (88)
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  - TR Photography (8)
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  - TX Home economics (69)
- U Military Science (3)
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- V Naval Science (16)
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  - VM Naval architecture. Shipbuilding. Marine engineering (3)
- X General Subject (692)
- Z Bibliography. Library Science. Information Resources (87)
  - Z004 Books. Writing. Paleography (7)
  - Z665 Library Science. Information Science (24)
  - Z719 Libraries (General) (11)
  - ZA Information resources (49)
    - ZA4050 Electronic information resources (25)
    - ZA4450 Databases (10)