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Library of Congress Subject Areas (40873)
- A General Works (113)
  - AC Collections. Series. Collected works (59)
  - AI Indexes (General) (19)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (39)
- B Philosophy. Psychology. Religion (16)
  - B Philosophy (General) (2)
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- 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)
  - E11 America (General) (2)
  - E151 United States (General) (3)
- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (232)
  - G Geography (General) (96)
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- H Social Sciences (16919)
  - H Social Sciences (General) (7208)
  - HA Statistics (29)
  - HB Economic Theory (2546)
  - HC Economic History and Conditions (725)
  - HD Industries. Land use. Labor (3109)
    - HD28 Management. Industrial Management (2265)
    - HD61 Risk Management (91)
  - HE Transportation and Communications (503)
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    - HF5601 Accounting (635)
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  - HN Social history and conditions. Social problems. Social reform (274)
  - HQ The family. Marriage. Woman (32)
  - HS Societies secret benevolent etc (4)
  - HT Communities. Classes. Races (41)
  - HV Social pathology. Social and public welfare (30)
  - HX Socialism. Communism. Anarchism (9)
- J Political Science (1505)
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- K Law (17)
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- L Education (213)
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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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- P Language and Literature (6)
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- Q Science (7045)
  - Q Science (General) (1576)
  - QA Mathematics (747)
    - QA75 Electronic computers. Computer science (585)
    - QA76 Computer software (241)
  - QC Physics (192)
  - QD Chemistry (1019)
  - QE Geology (3632)
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  - QK Botany (37)
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- R Medicine (22)
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  - RV Botanic, Thomsonian, and eclectic medicine (1)
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- S Agriculture (3632)
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  - SB Plant culture (455)
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  - SF Animal culture (51)
  - SH Aquaculture. Fisheries. Angling (16)
- T Technology (11215)
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    - T201 Patents. Trademarks (35)
  - TA Engineering (General). Civil engineering (General) (2742)
  - TC Hydraulic engineering. Ocean engineering (249)
  - TD Environmental technology. Sanitary engineering (881)
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  - TF Railroad engineering and operation (8)
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  - TJ Mechanical engineering and machinery (112)
  - TK Electrical engineering. Electronics Nuclear engineering (218)
  - TL Motor vehicles. Aeronautics. Astronautics (4)
  - TN Mining engineering. Metallurgy (2018)
  - TP Chemical technology (1003)
  - TR Photography (6)
  - TS Manufactures (460)
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  - TX Home economics (30)
- U Military Science (17)
  - U Military Science (General) (17)
- Z Bibliography. Library Science. Information Resources (891)
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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)