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Library of Congress Subject Areas (28245)
- A General Works (66)
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- B Philosophy. Psychology. Religion (993)
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- C Auxiliary Sciences of History (37)
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- D History General and Old World (313)
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- G Geography. Anthropology. Recreation (1521)
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- L Education (4359)
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- M Music and Books on Music (70)
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- N Fine Arts (94)
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- Q Science (3374)
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- S Agriculture (150)
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- T Technology (2256)
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  - TK Electrical engineering. Electronics Nuclear engineering (221)
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- U Military Science (48)
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- V Naval Science (3)
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