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Library of Congress Subject Areas (5918)
- A General Works (33)
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- B Philosophy. Psychology. Religion (30)
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- C Auxiliary Sciences of History (6)
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- D History General and Old World (6)
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- G Geography. Anthropology. Recreation (28)
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- L Education (272)
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- P Language and Literature (16)
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- Q Science (1720)
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- T Technology (4111)
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  - TK Electrical engineering. Electronics Nuclear engineering (924)
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- U Military Science (11)
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- V Naval Science (5)
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