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Library of Congress Subject Areas (22623)
- A General Works (15)
  - 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 (6)
- B Philosophy. Psychology. Religion (2206)
  - B Philosophy (General) (153)
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- C Auxiliary Sciences of History (31)
  - C Auxiliary sciences of history (General) (6)
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- D History General and Old World (302)
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- E History America (15)
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- F History United States, Canada, Latin America (6)
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- G Geography. Anthropology. Recreation (1424)
  - G Geography (General) (69)
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- H Social Sciences (6461)
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- L Education (2050)
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- M Music and Books on Music (210)
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- N Fine Arts (1085)
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- P Language and Literature (979)
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- Q Science (6176)
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- R Medicine (2826)
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  - RT Nursing (446)
  - RV Botanic, Thomsonian, and eclectic medicine (29)
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  - RZ Other systems of medicine (69)
- S Agriculture (2385)
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- T Technology (3809)
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  - TA Engineering (General). Civil engineering (General) (1168)
  - TC Hydraulic engineering. Ocean engineering (31)
  - TD Environmental technology. Sanitary engineering (253)
  - TE Highway engineering. Roads and pavements (13)
  - TF Railroad engineering and operation (15)
  - TG Bridge engineering (7)
  - TH Building construction (282)
  - TJ Mechanical engineering and machinery (262)
  - TK Electrical engineering. Electronics Nuclear engineering (669)
  - TL Motor vehicles. Aeronautics. Astronautics (106)
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  - TP Chemical technology (204)
  - TR Photography (38)
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  - TX Home economics (21)
- U Military Science (18)
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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 (174)
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  - Z665 Library Science. Information Science (32)
  - Z719 Libraries (General) (8)
  - ZA Information resources (62)
    - ZA4050 Electronic information resources (18)
    - ZA4450 Databases (6)