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Library of Congress Subject Areas (21843)
- A General Works (15)
  - AC Collections. Series. Collected works (7)
  - AM Museums (General). Collectors and collecting (General) (1)
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- B Philosophy. Psychology. Religion (2087)
  - B Philosophy (General) (146)
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- C Auxiliary Sciences of History (30)
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- D History General and Old World (288)
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- E History America (15)
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- F History United States, Canada, Latin America (6)
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- G Geography. Anthropology. Recreation (1357)
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- L Education (1913)
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- M Music and Books on Music (204)
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- N Fine Arts (1018)
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- Q Science (5930)
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- R Medicine (2700)
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- S Agriculture (2333)
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- T Technology (3679)
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  - TA Engineering (General). Civil engineering (General) (1162)
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  - TF Railroad engineering and operation (15)
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  - TH Building construction (276)
  - TJ Mechanical engineering and machinery (257)
  - TK Electrical engineering. Electronics Nuclear engineering (658)
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- U Military Science (15)
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- V Naval Science (75)
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- Z Bibliography. Library Science. Information Resources (173)
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  - Z719 Libraries (General) (8)
  - ZA Information resources (61)
    - ZA4050 Electronic information resources (18)
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