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Library of Congress Subject Areas (13698)
- A General Works (261)
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- B Philosophy. Psychology. Religion (198)
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- C Auxiliary Sciences of History (23)
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- G Geography. Anthropology. Recreation (186)
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- L Education (7201)
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- N Fine Arts (276)
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- R Medicine (587)
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- S Agriculture (87)
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- T Technology (1270)
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- U Military Science (6)
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- V Naval Science (1)
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- Z Bibliography. Library Science. Information Resources (114)
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  - Z719 Libraries (General) (43)
  - ZA Information resources (44)
    - ZA4050 Electronic information resources (19)
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