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Library of Congress Subject Areas (49265)
- A General Works (63)
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- B Philosophy. Psychology. Religion (3517)
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- C Auxiliary Sciences of History (7)
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- L Education (16294)
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- M Music and Books on Music (19)
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- N Fine Arts (443)
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- Q Science (2803)
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- R Medicine (7761)
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- S Agriculture (67)
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- T Technology (4276)
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- U Military Science (1)
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- V Naval Science (14)
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- X General Subject (321)
- Z Bibliography. Library Science. Information Resources (59)
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    - ZA4050 Electronic information resources (18)
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