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Library of Congress Subject Areas (16304)
- A General Works (28)
  - AC Collections. Series. Collected works (5)
  - AI Indexes (General) (5)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (17)
- B Philosophy. Psychology. Religion (660)
  - B Philosophy (General) (5)
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  - BJ Ethics (27)
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  - BP Islam. Bahaism. Theosophy, etc (472)
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- C Auxiliary Sciences of History (8)
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- D History General and Old World (237)
  - D History (General) (12)
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    - D839 Post-war History, 1945 on (1)
    - D901 Europe (General) (1)
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- E History America (1)
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- G Geography. Anthropology. Recreation (1073)
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- H Social Sciences (6833)
  - H Social Sciences (General) (611)
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  - HQ The family. Marriage. Woman (332)
  - HS Societies secret benevolent etc (2)
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  - HV Social pathology. Social and public welfare (543)
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- J Political Science (1431)
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  - JV Colonies and colonization. Emigration and immigration. International migration (26)
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- K Law (564)
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- L Education (3024)
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  - LD Individual institutions (United States) (1)
  - LG Individual institutions (Asia. Africa) (763)
  - LT Textbooks (6)
- M Music and Books on Music (63)
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- N Fine Arts (73)
  - N Visual arts (General) For photography, see TR (37)
  - NA Architecture (3)
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- P Language and Literature (360)
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- Q Science (1643)
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    - QA75 Electronic computers. Computer science (489)
    - QA76 Computer software (888)
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- R Medicine (125)
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- S Agriculture (99)
  - S Agriculture (General) (58)
  - SB Plant culture (11)
  - SD Forestry (4)
  - SF Animal culture (5)
  - SH Aquaculture. Fisheries. Angling (21)
- T Technology (1370)
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  - TA Engineering (General). Civil engineering (General) (16)
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  - TH Building construction (118)
  - TJ Mechanical engineering and machinery (23)
  - TK Electrical engineering. Electronics Nuclear engineering (173)
  - TL Motor vehicles. Aeronautics. Astronautics (12)
  - TP Chemical technology (1)
  - TR Photography (15)
  - TS Manufactures (292)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (6)
- U Military Science (34)
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- V Naval Science (2)
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  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (109)
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  - Z719 Libraries (General) (32)
  - ZA Information resources (12)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (1)