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- Library of Congress Subject Areas (22998)
- A General Works (84)
- E History America (261)
- H Social Sciences (4954)
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- L Education (1435)
- N Fine Arts (360)
- P Language and Literature (1372)
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- R Medicine (3122)
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- T Technology (1615)
- U Military Science (56)
- V Naval Science (8)
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