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Library of Congress Subject Areas (34)
- A General Works (10)
  - AC Collections. Series. Collected works (27)
  - AI Indexes (General) (46)
  - AM Museums (General). Collectors and collecting (General) (2)
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- B Philosophy. Psychology. Religion (3)
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- C Auxiliary Sciences of History (3)
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- E History America (8)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (1)
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- H Social Sciences (34)
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- L Education (37)
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  - LD Individual institutions (United States) (2)
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- M Music and Books on Music (5)
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- N Fine Arts (3)
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- Q Science (22)
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- R Medicine (1)
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- S Agriculture (37)
  - S Agriculture (General) (217)
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  - SH Aquaculture. Fisheries. Angling (25)
- T Technology (16)
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  - TA Engineering (General). Civil engineering (General) (190)
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  - TJ Mechanical engineering and machinery (69)
  - TK Electrical engineering. Electronics Nuclear engineering (196)
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- U Military Science (21)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (12)
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    - ZA4050 Electronic information resources (12)
    - ZA4450 Databases (7)