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Library of Congress Subject Areas (3000)
- A General Works (24)
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- B Philosophy. Psychology. Religion (2)
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- C Auxiliary Sciences of History (1)
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- D History General and Old World (1)
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- H Social Sciences (867)
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- J Political Science (51)
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- K Law (342)
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- L Education (290)
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- Q Science (64)
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- R Medicine (712)
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- S Agriculture (221)
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- T Technology (280)
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- Z Bibliography. Library Science. Information Resources (136)
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