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Library of Congress Subject Areas (23762)
- A General Works (16)
  - AC Collections. Series. Collected works (7)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
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- B Philosophy. Psychology. Religion (2350)
  - B Philosophy (General) (153)
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- C Auxiliary Sciences of History (32)
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- D History General and Old World (309)
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- E History America (18)
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- F History United States, Canada, Latin America (6)
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- G Geography. Anthropology. Recreation (1514)
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- L Education (2239)
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- M Music and Books on Music (224)
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- N Fine Arts (1164)
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- Q Science (6617)
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- R Medicine (3039)
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- S Agriculture (2500)
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- T Technology (3972)
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  - TA Engineering (General). Civil engineering (General) (1171)
  - TC Hydraulic engineering. Ocean engineering (31)
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  - TE Highway engineering. Roads and pavements (14)
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  - TH Building construction (292)
  - TJ Mechanical engineering and machinery (266)
  - TK Electrical engineering. Electronics Nuclear engineering (675)
  - TL Motor vehicles. Aeronautics. Astronautics (107)
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- U Military Science (25)
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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 (180)
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  - Z719 Libraries (General) (9)
  - ZA Information resources (64)
    - ZA4050 Electronic information resources (18)
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