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Library of Congress Subject Areas (28936)
- A General Works (83)
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- B Philosophy. Psychology. Religion (1126)
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- C Auxiliary Sciences of History (59)
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- D History General and Old World (345)
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- E History America (5)
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- G Geography. Anthropology. Recreation (1533)
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- M Music and Books on Music (71)
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- N Fine Arts (99)
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- Q Science (3406)
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- R Medicine (196)
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- S Agriculture (157)
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- T Technology (2300)
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  - TK Electrical engineering. Electronics Nuclear engineering (222)
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- U Military Science (50)
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- V Naval Science (4)
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- Z Bibliography. Library Science. Information Resources (153)
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    - ZA4050 Electronic information resources (31)
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