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Library of Congress Subject Areas (19942)
- A General Works (412)
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  - AM Museums (General). Collectors and collecting (General) (17)
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- B Philosophy. Psychology. Religion (267)
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- C Auxiliary Sciences of History (34)
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- D History General and Old World (103)
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- E History America (2)
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- G Geography. Anthropology. Recreation (304)
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- M Music and Books on Music (19)
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- N Fine Arts (372)
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- Q Science (1910)
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- R Medicine (806)
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- S Agriculture (185)
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- T Technology (2027)
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  - TA Engineering (General). Civil engineering (General) (121)
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  - TJ Mechanical engineering and machinery (108)
  - TK Electrical engineering. Electronics Nuclear engineering (141)
  - TL Motor vehicles. Aeronautics. Astronautics (25)
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  - TP Chemical technology (25)
  - TR Photography (60)
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  - TT Handicrafts Arts and crafts (41)
  - TX Home economics (64)
- U Military Science (7)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (173)
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  - Z665 Library Science. Information Science (71)
  - Z719 Libraries (General) (55)
  - ZA Information resources (57)
    - ZA4050 Electronic information resources (22)
    - ZA4450 Databases (15)