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Library of Congress Subject Areas (3377)
- D History General and Old World (1)
  - DA Great Britain (1)
- G Geography. Anthropology. Recreation (6)
  - G Geography (General) (6)
- H Social Sciences (3126)
  - H Social Sciences (General) (2830)
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  - HE Transportation and Communications (157)
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    - QA76 Computer software (1)
- S Agriculture (83)
  - S Agriculture (General) (83)
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  - T Technology (General) (230)
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