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Library of Congress Subject Areas (16226)
- A General Works (7)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1767)
  - B Philosophy (General) (26)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (172)
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  - DE The Mediterranean Region. The Greco-Roman World (6)
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- E History America (25)
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- F History United States, Canada, Latin America (28)
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- G Geography. Anthropology. Recreation (371)
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- H Social Sciences (5017)
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- J Political Science (786)
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- K Law (645)
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- L Education (337)
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  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (515)
  - M Music (307)
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- N Fine Arts (124)
  - N Visual arts (General) For photography, see TR (21)
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- P Language and Literature (875)
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- Q Science (3089)
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  - QR Microbiology (124)
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- R Medicine (3834)
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  - RB Pathology (6)
  - RC Internal medicine (1257)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (73)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (605)
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  - RD Surgery (21)
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- S Agriculture (63)
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- T Technology (2556)
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  - TA Engineering (General). Civil engineering (General) (1113)
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  - TH Building construction (67)
  - TJ Mechanical engineering and machinery (445)
  - TK Electrical engineering. Electronics Nuclear engineering (624)
  - TL Motor vehicles. Aeronautics. Astronautics (263)
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  - TR Photography (6)
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  - TX Home economics (49)
- U Military Science (24)
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- V Naval Science (16)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (740)
  - Z665 Library Science. Information Science (645)
  - Z719 Libraries (General) (11)
  - ZA Information resources (89)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)