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Library of Congress Subject Areas (20045)
- A General Works (244)
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- B Philosophy. Psychology. Religion (433)
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- C Auxiliary Sciences of History (2)
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- D History General and Old World (41)
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- G Geography. Anthropology. Recreation (454)
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- H Social Sciences (2515)
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- L Education (2404)
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- M Music and Books on Music (10)
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- Q Science (3613)
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- R Medicine (164)
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- S Agriculture (106)
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- T Technology (12256)
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  - TK Electrical engineering. Electronics Nuclear engineering (1615)
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- U Military Science (14)
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- V Naval Science (6)
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- Z Bibliography. Library Science. Information Resources (114)
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