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Library of Congress Subject Areas (3073)
- B Philosophy. Psychology. Religion (129)
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- C Auxiliary Sciences of History (1)
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- D History General and Old World (7)
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- G Geography. Anthropology. Recreation (72)
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- H Social Sciences (951)
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- M Music and Books on Music (7)
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- N Fine Arts (3)
  - N Visual arts (General) For photography, see TR (2)
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- P Language and Literature (741)
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- Q Science (563)
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- R Medicine (14)
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- S Agriculture (63)
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  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (200)
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  - TA Engineering (General). Civil engineering (General) (77)
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- Z Bibliography. Library Science. Information Resources (95)
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