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Library of Congress Subject Areas (20132)
- A General Works (416)
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  - AM Museums (General). Collectors and collecting (General) (17)
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- B Philosophy. Psychology. Religion (270)
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- C Auxiliary Sciences of History (34)
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- D History General and Old World (106)
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- G Geography. Anthropology. Recreation (310)
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- M Music and Books on Music (19)
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- N Fine Arts (375)
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- R Medicine (806)
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- S Agriculture (186)
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- T Technology (2053)
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  - TK Electrical engineering. Electronics Nuclear engineering (143)
  - TL Motor vehicles. Aeronautics. Astronautics (26)
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  - TR Photography (61)
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  - TT Handicrafts Arts and crafts (42)
  - TX Home economics (64)
- U Military Science (7)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (174)
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  - ZA Information resources (57)
    - ZA4050 Electronic information resources (22)
    - ZA4450 Databases (15)