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Library of Congress Subject Areas (990)
- A General Works (24)
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- B Philosophy. Psychology. Religion (2)
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- E History America (1)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (3)
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- H Social Sciences (441)
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- L Education (203)
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- Q Science (47)
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- S Agriculture (127)
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- T Technology (12)
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- V Naval Science (2)
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- Z Bibliography. Library Science. Information Resources (5)
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    - ZA4050 Electronic information resources (3)
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