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Library of Congress Subject Areas (18747)
- A General Works (239)
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- B Philosophy. Psychology. Religion (405)
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- C Auxiliary Sciences of History (2)
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- G Geography. Anthropology. Recreation (429)
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- L Education (2273)
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- Q Science (3312)
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- R Medicine (144)
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- S Agriculture (94)
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- T Technology (11484)
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- Z Bibliography. Library Science. Information Resources (103)
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