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Library of Congress Subject Areas (26237)
- A General Works (43)
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- B Philosophy. Psychology. Religion (932)
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- C Auxiliary Sciences of History (18)
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- D History General and Old World (298)
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- G Geography. Anthropology. Recreation (1474)
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- M Music and Books on Music (69)
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- N Fine Arts (90)
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- Q Science (3110)
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- S Agriculture (130)
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- T Technology (2035)
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- U Military Science (44)
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