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Library of Congress Subject Areas (544)
- B Philosophy. Psychology. Religion (16)
  - BC Logic (1)
  - BF Psychology (15)
- G Geography. Anthropology. Recreation (1)
  - G Geography (General) (1)
- H Social Sciences (104)
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- L Education (9)
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- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- P Language and Literature (14)
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- Q Science (114)
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- R Medicine (12)
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- T Technology (273)
  - T Technology (General) (116)
  - TA Engineering (General). Civil engineering (General) (81)
  - TD Environmental technology. Sanitary engineering (2)
  - TK Electrical engineering. Electronics Nuclear engineering (63)
  - TL Motor vehicles. Aeronautics. Astronautics (5)
  - TN Mining engineering. Metallurgy (4)
  - TP Chemical technology (2)
  - TR Photography (1)
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- Z Bibliography. Library Science. Information Resources (4)
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