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Library of Congress Subject Areas (22061)
- 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)
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- B Philosophy. Psychology. Religion (2117)
  - B Philosophy (General) (146)
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- C Auxiliary Sciences of History (30)
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- D History General and Old World (290)
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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 (1369)
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- L Education (1955)
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- M Music and Books on Music (204)
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- N Fine Arts (1030)
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- P Language and Literature (957)
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- Q Science (6005)
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- R Medicine (2744)
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  - RT Nursing (436)
  - RV Botanic, Thomsonian, and eclectic medicine (28)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (68)
- S Agriculture (2344)
  - S Agriculture (General) (1935)
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  - SH Aquaculture. Fisheries. Angling (81)
- T Technology (3723)
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  - TA Engineering (General). Civil engineering (General) (1163)
  - TC Hydraulic engineering. Ocean engineering (31)
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  - TE Highway engineering. Roads and pavements (13)
  - TF Railroad engineering and operation (15)
  - TG Bridge engineering (7)
  - TH Building construction (277)
  - TJ Mechanical engineering and machinery (259)
  - TK Electrical engineering. Electronics Nuclear engineering (659)
  - TL Motor vehicles. Aeronautics. Astronautics (105)
  - TN Mining engineering. Metallurgy (97)
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  - TR Photography (36)
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- U Military Science (16)
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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 (173)
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  - Z719 Libraries (General) (8)
  - ZA Information resources (61)
    - ZA4050 Electronic information resources (18)
    - ZA4450 Databases (6)