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Library of Congress Subject Areas (27797)
- A General Works (268)
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- B Philosophy. Psychology. Religion (628)
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- C Auxiliary Sciences of History (5)
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- G Geography. Anthropology. Recreation (575)
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- H Social Sciences (4271)
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- J Political Science (219)
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- M Music and Books on Music (11)
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- Q Science (5376)
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- R Medicine (386)
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- S Agriculture (194)
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- T Technology (16974)
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  - TK Electrical engineering. Electronics Nuclear engineering (2350)
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- U Military Science (15)
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- V Naval Science (8)
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- Z Bibliography. Library Science. Information Resources (173)
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