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Library of Congress Subject Areas (11392)
- A General Works (26)
  - AC Collections. Series. Collected works (4)
  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (17)
- B Philosophy. Psychology. Religion (496)
  - B Philosophy (General) (3)
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  - BP Islam. Bahaism. Theosophy, etc (362)
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- D History General and Old World (99)
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    - D839 Post-war History, 1945 on (1)
    - D901 Europe (General) (1)
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- E History America (1)
  - E11 America (General) (1)
- G Geography. Anthropology. Recreation (722)
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- H Social Sciences (4827)
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  - HQ The family. Marriage. Woman (231)
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  - HT Communities. Classes. Races (169)
  - HV Social pathology. Social and public welfare (447)
  - HX Socialism. Communism. Anarchism (3)
- J Political Science (1067)
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  - JV Colonies and colonization. Emigration and immigration. International migration (20)
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- K Law (431)
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- L Education (2240)
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  - LC Special aspects of education (262)
    - LC5201 Education extension. Adult education. Continuing education (117)
  - LD Individual institutions (United States) (1)
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- M Music and Books on Music (53)
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- N Fine Arts (61)
  - N Visual arts (General) For photography, see TR (33)
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- P Language and Literature (290)
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- Q Science (905)
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    - QA75 Electronic computers. Computer science (147)
    - QA76 Computer software (569)
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- R Medicine (87)
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- S Agriculture (71)
  - S Agriculture (General) (45)
  - SB Plant culture (5)
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  - SF Animal culture (4)
  - SH Aquaculture. Fisheries. Angling (13)
- T Technology (958)
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  - TH Building construction (77)
  - TJ Mechanical engineering and machinery (15)
  - TK Electrical engineering. Electronics Nuclear engineering (146)
  - TL Motor vehicles. Aeronautics. Astronautics (11)
  - TR Photography (11)
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- U Military Science (29)
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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 (87)
  - Z004 Books. Writing. Paleography (22)
  - Z665 Library Science. Information Science (23)
  - Z719 Libraries (General) (31)
  - ZA Information resources (12)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (1)