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Library of Congress Subject Areas (7022)
- A General Works (18)
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- B Philosophy. Psychology. Religion (40)
  - B Philosophy (General) (6)
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- C Auxiliary Sciences of History (1)
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- D History General and Old World (4)
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- G Geography. Anthropology. Recreation (29)
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- H Social Sciences (632)
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- L Education (247)
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- S Agriculture (28)
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- T Technology (5146)
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- Z Bibliography. Library Science. Information Resources (27)
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