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Library of Congress Subject Areas (22202)
- A General Works (281)
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  - AI Indexes (General) (47)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (119)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (277)
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- C Auxiliary Sciences of History (22)
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- D History General and Old World (38)
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- E History America (33)
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- F History United States, Canada, Latin America (9)
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- G Geography. Anthropology. Recreation (91)
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- H Social Sciences (8423)
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- K Law (2911)
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- L Education (1032)
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  - LD Individual institutions (United States) (3)
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- M Music and Books on Music (51)
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- N Fine Arts (72)
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- Q Science (2762)
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- R Medicine (5538)
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  - RT Nursing (1795)
  - RV Botanic, Thomsonian, and eclectic medicine (84)
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- S Agriculture (87)
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- T Technology (2096)
  - T Technology (General) (963)
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  - TA Engineering (General). Civil engineering (General) (515)
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  - TH Building construction (52)
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  - TK Electrical engineering. Electronics Nuclear engineering (133)
  - TL Motor vehicles. Aeronautics. Astronautics (67)
  - TN Mining engineering. Metallurgy (17)
  - TP Chemical technology (27)
  - TR Photography (15)
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  - TT Handicrafts Arts and crafts (8)
  - TX Home economics (59)
- U Military Science (89)
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- V Naval Science (235)
  - V Naval Science (General) (186)
  - VM Naval architecture. Shipbuilding. Marine engineering (191)
- Z Bibliography. Library Science. Information Resources (368)
  - Z004 Books. Writing. Paleography (22)
  - Z665 Library Science. Information Science (112)
  - Z719 Libraries (General) (147)
  - ZA Information resources (143)
    - ZA4050 Electronic information resources (73)
    - ZA4450 Databases (55)