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Library of Congress Subject Areas (19847)
- A General Works (28)
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  - AI Indexes (General) (5)
  - AM Museums (General). Collectors and collecting (General) (2)
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- B Philosophy. Psychology. Religion (823)
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- C Auxiliary Sciences of History (9)
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- D History General and Old World (259)
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- E History America (1)
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- G Geography. Anthropology. Recreation (1322)
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- H Social Sciences (8243)
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- J Political Science (1720)
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- K Law (692)
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- L Education (3648)
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  - LD Individual institutions (United States) (1)
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- M Music and Books on Music (64)
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- N Fine Arts (80)
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- Q Science (2128)
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- R Medicine (160)
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- S Agriculture (122)
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- T Technology (1848)
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  - TH Building construction (190)
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  - TK Electrical engineering. Electronics Nuclear engineering (209)
  - TL Motor vehicles. Aeronautics. Astronautics (17)
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  - TR Photography (15)
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  - TX Home economics (31)
- U Military Science (40)
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- V Naval Science (2)
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- Z Bibliography. Library Science. Information Resources (123)
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  - ZA Information resources (13)
    - ZA4050 Electronic information resources (8)
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