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Library of Congress Subject Areas (22081)
- 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 (2120)
  - B Philosophy (General) (146)
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    - BV1460 Religious Education (4)
- C Auxiliary Sciences of History (30)
  - C Auxiliary sciences of history (General) (5)
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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 (1370)
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- H Social Sciences (6228)
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- L Education (1958)
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- M Music and Books on Music (204)
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- N Fine Arts (1030)
  - N Visual arts (General) For photography, see TR (469)
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- P Language and Literature (959)
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- Q Science (6016)
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- R Medicine (2745)
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  - RM Therapeutics. Pharmacology (195)
  - RS Pharmacy and materia medica (321)
  - RT Nursing (436)
  - RV Botanic, Thomsonian, and eclectic medicine (28)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (68)
- S Agriculture (2346)
  - S Agriculture (General) (1937)
  - SB Plant culture (571)
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  - SH Aquaculture. Fisheries. Angling (81)
- T Technology (3730)
  - T Technology (General) (1201)
    - T201 Patents. Trademarks (5)
  - TA Engineering (General). Civil engineering (General) (1163)
  - TC Hydraulic engineering. Ocean engineering (31)
  - TD Environmental technology. Sanitary engineering (249)
  - 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)
  - TP Chemical technology (200)
  - TR Photography (36)
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  - TX Home economics (21)
- 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)
  - Z004 Books. Writing. Paleography (77)
  - Z665 Library Science. Information Science (31)
  - Z719 Libraries (General) (8)
  - ZA Information resources (61)
    - ZA4050 Electronic information resources (18)
    - ZA4450 Databases (6)