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Library of Congress Subject Areas (28747)
- A General Works (83)
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- B Philosophy. Psychology. Religion (1090)
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- C Auxiliary Sciences of History (56)
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- D History General and Old World (323)
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- G Geography. Anthropology. Recreation (1530)
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- L Education (4421)
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- M Music and Books on Music (71)
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- N Fine Arts (96)
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- Q Science (3394)
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- R Medicine (192)
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- S Agriculture (155)
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- T Technology (2288)
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- U Military Science (48)
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- V Naval Science (3)
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- Z Bibliography. Library Science. Information Resources (153)
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  - ZA Information resources (37)
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    - ZA4450 Databases (5)