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Library of Congress Subject Areas (43530)
- A General Works (13)
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- B Philosophy. Psychology. Religion (69)
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- C Auxiliary Sciences of History (80)
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- D History General and Old World (45)
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- G Geography. Anthropology. Recreation (118)
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- R Medicine (9867)
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- S Agriculture (7347)
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- T Technology (4960)
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- U Military Science (2)
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- V Naval Science (457)
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- Z Bibliography. Library Science. Information Resources (3)
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