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Library of Congress Subject Areas (14272)
- A General Works (8)
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- B Philosophy. Psychology. Religion (1681)
  - B Philosophy (General) (283)
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- C Auxiliary Sciences of History (31)
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- D History General and Old World (512)
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- E History America (62)
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- F History United States, Canada, Latin America (55)
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- G Geography. Anthropology. Recreation (314)
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- H Social Sciences (5189)
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- L Education (193)
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- M Music and Books on Music (21)
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- N Fine Arts (169)
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- Q Science (3477)
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- R Medicine (1135)
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- S Agriculture (53)
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- T Technology (306)
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  - TK Electrical engineering. Electronics Nuclear engineering (228)
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  - TR Photography (19)
- U Military Science (24)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (66)
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  - Z719 Libraries (General) (2)
  - ZA Information resources (44)
    - ZA4050 Electronic information resources (37)
    - ZA4450 Databases (4)