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Library of Congress Subject Areas (17856)
- A General Works (210)
  - AC Collections. Series. Collected works (51)
  - AI Indexes (General) (17)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (137)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (396)
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- C Auxiliary Sciences of History (1)
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- D History General and Old World (41)
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- G Geography. Anthropology. Recreation (419)
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- H Social Sciences (2174)
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- J Political Science (133)
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- K Law (6)
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- L Education (2170)
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- M Music and Books on Music (10)
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- N Fine Arts (19)
  - N Visual arts (General) For photography, see TR (3)
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- Q Science (3142)
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- R Medicine (140)
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- S Agriculture (91)
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- T Technology (10917)
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  - TJ Mechanical engineering and machinery (2310)
  - TK Electrical engineering. Electronics Nuclear engineering (1433)
  - TL Motor vehicles. Aeronautics. Astronautics (337)
  - TN Mining engineering. Metallurgy (56)
  - TP Chemical technology (2697)
  - TR Photography (8)
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- U Military Science (14)
  - U Military Science (General) (14)
- V Naval Science (6)
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  - VM Naval architecture. Shipbuilding. Marine engineering (4)
- Z Bibliography. Library Science. Information Resources (103)
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  - ZA Information resources (22)
    - ZA4050 Electronic information resources (9)
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