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Library of Congress Subject Areas (40574)
- A General Works (110)
  - AC Collections. Series. Collected works (58)
  - AI Indexes (General) (18)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (38)
- B Philosophy. Psychology. Religion (16)
  - B Philosophy (General) (2)
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  - BP Islam. Bahaism. Theosophy, etc (2)
- C Auxiliary Sciences of History (1)
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- D History General and Old World (7)
  - D History (General) (1)
    - D204 Modern History (1)
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- E History America (5)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (226)
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- H Social Sciences (16749)
  - H Social Sciences (General) (7154)
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  - HB Economic Theory (2518)
  - HC Economic History and Conditions (713)
  - HD Industries. Land use. Labor (3074)
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  - HQ The family. Marriage. Woman (31)
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  - HT Communities. Classes. Races (39)
  - HV Social pathology. Social and public welfare (30)
  - HX Socialism. Communism. Anarchism (8)
- J Political Science (1490)
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- K Law (17)
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- L Education (207)
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- M Music and Books on Music (4)
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- N Fine Arts (50)
  - N Visual arts (General) For photography, see TR (24)
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- Q Science (7011)
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    - QA75 Electronic computers. Computer science (573)
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  - QC Physics (189)
  - QD Chemistry (1017)
  - QE Geology (3620)
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  - QK Botany (36)
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- R Medicine (22)
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  - RV Botanic, Thomsonian, and eclectic medicine (1)
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- S Agriculture (3597)
  - S Agriculture (General) (3236)
  - SB Plant culture (451)
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- T Technology (11162)
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    - T201 Patents. Trademarks (35)
  - TA Engineering (General). Civil engineering (General) (2741)
  - TC Hydraulic engineering. Ocean engineering (249)
  - TD Environmental technology. Sanitary engineering (878)
  - TE Highway engineering. Roads and pavements (11)
  - TF Railroad engineering and operation (7)
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  - TK Electrical engineering. Electronics Nuclear engineering (218)
  - TL Motor vehicles. Aeronautics. Astronautics (4)
  - TN Mining engineering. Metallurgy (1997)
  - TP Chemical technology (995)
  - TR Photography (6)
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  - TX Home economics (30)
- U Military Science (17)
  - U Military Science (General) (17)
- Z Bibliography. Library Science. Information Resources (890)
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  - Z665 Library Science. Information Science (38)
  - Z719 Libraries (General) (6)
  - ZA Information resources (857)
    - ZA4050 Electronic information resources (115)
    - ZA4450 Databases (433)