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Library of Congress Subject Areas (16544)
- A General Works (313)
  - AC Collections. Series. Collected works (78)
  - AI Indexes (General) (64)
  - AM Museums (General). Collectors and collecting (General) (14)
  - AS Academies and learned societies (General) (178)
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- B Philosophy. Psychology. Religion (228)
  - B Philosophy (General) (41)
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- C Auxiliary Sciences of History (28)
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- D History General and Old World (78)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (231)
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- H Social Sciences (4534)
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- L Education (8718)
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- M Music and Books on Music (17)
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- N Fine Arts (322)
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- P Language and Literature (941)
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- Q Science (1590)
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- R Medicine (639)
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- S Agriculture (129)
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- T Technology (1664)
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  - TA Engineering (General). Civil engineering (General) (106)
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  - TR Photography (54)
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  - TX Home economics (51)
- U Military Science (6)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (139)
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  - Z719 Libraries (General) (47)
  - ZA Information resources (49)
    - ZA4050 Electronic information resources (19)
    - ZA4450 Databases (15)