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Library of Congress Subject Areas (19271)
- A General Works (10)
  - AC Collections. Series. Collected works (5)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (1691)
  - B Philosophy (General) (113)
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    - BV1460 Religious Education (3)
- C Auxiliary Sciences of History (25)
  - C Auxiliary sciences of history (General) (2)
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- D History General and Old World (253)
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- E History America (14)
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- F History United States, Canada, Latin America (4)
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- G Geography. Anthropology. Recreation (1155)
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- H Social Sciences (4778)
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- J Political Science (233)
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- L Education (1512)
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- M Music and Books on Music (189)
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- N Fine Arts (791)
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- P Language and Literature (865)
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- Q Science (5204)
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- R Medicine (2306)
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  - RB Pathology (50)
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  - RM Therapeutics. Pharmacology (192)
  - RS Pharmacy and materia medica (309)
  - RT Nursing (410)
  - RV Botanic, Thomsonian, and eclectic medicine (25)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (60)
- S Agriculture (2066)
  - S Agriculture (General) (1672)
  - SB Plant culture (548)
  - SD Forestry (53)
  - SF Animal culture (102)
  - SH Aquaculture. Fisheries. Angling (75)
- T Technology (3283)
  - T Technology (General) (786)
    - T201 Patents. Trademarks (5)
  - TA Engineering (General). Civil engineering (General) (1125)
  - TC Hydraulic engineering. Ocean engineering (26)
  - TD Environmental technology. Sanitary engineering (244)
  - TE Highway engineering. Roads and pavements (11)
  - TF Railroad engineering and operation (15)
  - TG Bridge engineering (7)
  - TH Building construction (229)
  - TJ Mechanical engineering and machinery (242)
  - TK Electrical engineering. Electronics Nuclear engineering (614)
  - TL Motor vehicles. Aeronautics. Astronautics (99)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (177)
  - TR Photography (27)
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  - TX Home economics (21)
- U Military Science (14)
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- V Naval Science (74)
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  - VM Naval architecture. Shipbuilding. Marine engineering (54)
- Z Bibliography. Library Science. Information Resources (132)
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  - Z665 Library Science. Information Science (28)
  - Z719 Libraries (General) (6)
  - ZA Information resources (28)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (5)