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Library of Congress Subject Areas (16137)
- A General Works (297)
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- B Philosophy. Psychology. Religion (226)
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- C Auxiliary Sciences of History (28)
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- N Fine Arts (316)
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- R Medicine (607)
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- T Technology (1590)
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- U Military Science (6)
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- Z Bibliography. Library Science. Information Resources (136)
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    - ZA4050 Electronic information resources (19)
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