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Library of Congress Subject Areas (64465)
- A General Works (546)
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- B Philosophy. Psychology. Religion (742)
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- C Auxiliary Sciences of History (147)
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- Q Science (6719)
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- R Medicine (13746)
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- S Agriculture (11276)
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- T Technology (7662)
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- U Military Science (14)
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- V Naval Science (9)
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- Z Bibliography. Library Science. Information Resources (181)
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    - ZA4050 Electronic information resources (40)
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