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Library of Congress Subject Areas (38711)
- A General Works (473)
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- B Philosophy. Psychology. Religion (882)
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- C Auxiliary Sciences of History (8)
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- D History General and Old World (119)
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- H Social Sciences (7151)
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- L Education (4599)
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- Q Science (8229)
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- R Medicine (698)
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- S Agriculture (331)
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- T Technology (23859)
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  - TK Electrical engineering. Electronics Nuclear engineering (3676)
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- U Military Science (23)
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- V Naval Science (9)
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- Z Bibliography. Library Science. Information Resources (227)
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