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Library of Congress Subject Areas (13552)
- A General Works (260)
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- B Philosophy. Psychology. Religion (196)
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- C Auxiliary Sciences of History (23)
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- D History General and Old World (70)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (183)
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- L Education (7148)
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- M Music and Books on Music (12)
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- N Fine Arts (274)
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- R Medicine (546)
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- S Agriculture (86)
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- T Technology (1243)
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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 (113)
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  - ZA Information resources (43)
    - ZA4050 Electronic information resources (18)
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