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Library of Congress Subject Areas (50041)
- A General Works (65)
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- B Philosophy. Psychology. Religion (3585)
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- C Auxiliary Sciences of History (7)
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- G Geography. Anthropology. Recreation (844)
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- L Education (16491)
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- M Music and Books on Music (19)
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- N Fine Arts (473)
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- Q Science (2858)
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- R Medicine (7890)
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- S Agriculture (68)
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- T Technology (4382)
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- U Military Science (1)
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- V Naval Science (14)
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  - VM Naval architecture. Shipbuilding. Marine engineering (3)
- X General Subject (334)
- Z Bibliography. Library Science. Information Resources (63)
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  - ZA Information resources (39)
    - ZA4050 Electronic information resources (20)
    - ZA4450 Databases (6)