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Library of Congress Subject Areas (23197)
- A General Works (16)
  - AC Collections. Series. Collected works (7)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (7)
- B Philosophy. Psychology. Religion (2291)
  - B Philosophy (General) (153)
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- C Auxiliary Sciences of History (32)
  - C Auxiliary sciences of history (General) (7)
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- D History General and Old World (304)
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- E History America (18)
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- F History United States, Canada, Latin America (6)
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- G Geography. Anthropology. Recreation (1470)
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- H Social Sciences (6699)
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- L Education (2143)
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- M Music and Books on Music (217)
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- N Fine Arts (1128)
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- Q Science (6410)
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- R Medicine (2942)
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  - RT Nursing (448)
  - RV Botanic, Thomsonian, and eclectic medicine (29)
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- S Agriculture (2436)
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  - SB Plant culture (579)
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  - SH Aquaculture. Fisheries. Angling (88)
- T Technology (3910)
  - T Technology (General) (1363)
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  - TA Engineering (General). Civil engineering (General) (1169)
  - TC Hydraulic engineering. Ocean engineering (31)
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  - TE Highway engineering. Roads and pavements (14)
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  - TH Building construction (284)
  - TJ Mechanical engineering and machinery (264)
  - TK Electrical engineering. Electronics Nuclear engineering (671)
  - TL Motor vehicles. Aeronautics. Astronautics (106)
  - TN Mining engineering. Metallurgy (97)
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  - TR Photography (40)
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- U Military Science (22)
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- V Naval Science (75)
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  - VM Naval architecture. Shipbuilding. Marine engineering (54)
- Z Bibliography. Library Science. Information Resources (177)
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  - Z665 Library Science. Information Science (34)
  - Z719 Libraries (General) (9)
  - ZA Information resources (62)
    - ZA4050 Electronic information resources (18)
    - ZA4450 Databases (6)