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Library of Congress Subject Areas (21302)
- A General Works (14)
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  - AM Museums (General). Collectors and collecting (General) (1)
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- B Philosophy. Psychology. Religion (2018)
  - B Philosophy (General) (146)
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- C Auxiliary Sciences of History (29)
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- D History General and Old World (286)
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- E History America (15)
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- F History United States, Canada, Latin America (5)
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- G Geography. Anthropology. Recreation (1297)
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- L Education (1832)
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- M Music and Books on Music (198)
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- N Fine Arts (952)
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- Q Science (5771)
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- R Medicine (2645)
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- S Agriculture (2300)
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- T Technology (3564)
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  - TA Engineering (General). Civil engineering (General) (1149)
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  - TH Building construction (257)
  - TJ Mechanical engineering and machinery (254)
  - TK Electrical engineering. Electronics Nuclear engineering (644)
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- U Military Science (15)
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- V Naval Science (75)
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  - VM Naval architecture. Shipbuilding. Marine engineering (54)
- Z Bibliography. Library Science. Information Resources (171)
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  - Z719 Libraries (General) (8)
  - ZA Information resources (59)
    - ZA4050 Electronic information resources (18)
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