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Library of Congress Subject Areas (58390)
- A General Works (73)
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- B Philosophy. Psychology. Religion (4232)
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- C Auxiliary Sciences of History (11)
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- G Geography. Anthropology. Recreation (1221)
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- M Music and Books on Music (21)
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- N Fine Arts (635)
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- Q Science (3366)
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- R Medicine (8720)
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- S Agriculture (84)
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- T Technology (5281)
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- U Military Science (3)
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- V Naval Science (16)
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  - VM Naval architecture. Shipbuilding. Marine engineering (3)
- X General Subject (707)
- Z Bibliography. Library Science. Information Resources (89)
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  - Z719 Libraries (General) (11)
  - ZA Information resources (51)
    - ZA4050 Electronic information resources (26)
    - ZA4450 Databases (12)