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Library of Congress Subject Areas (3780)
- A General Works (35)
  - AC Collections. Series. Collected works (16)
  - AI Indexes (General) (1)
  - AM Museums (General). Collectors and collecting (General) (8)
  - AS Academies and learned societies (General) (13)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (115)
  - B Philosophy (General) (32)
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- D History General and Old World (66)
  - D History (General) (36)
    - D051 Ancient History (1)
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    - D839 Post-war History, 1945 on (3)
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- E History America (8)
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  - E151 United States (General) (2)
- F History United States, Canada, Latin America (3)
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- G Geography. Anthropology. Recreation (61)
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- H Social Sciences (1018)
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- J Political Science (46)
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- K Law (52)
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- L Education (903)
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    - LC5201 Education extension. Adult education. Continuing education (74)
  - LG Individual institutions (Asia. Africa) (8)
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- M Music and Books on Music (565)
  - M Music (528)
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- N Fine Arts (642)
  - N Visual arts (General) For photography, see TR (399)
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  - NX Arts in general (180)
- P Language and Literature (198)
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    - P Philology. Linguistics (34)
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- Q Science (398)
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- R Medicine (267)
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  - RT Nursing (143)
  - RZ Other systems of medicine (55)
- S Agriculture (44)
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  - SD Forestry (2)
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  - SH Aquaculture. Fisheries. Angling (3)
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- T Technology (464)
  - T Technology (General) (114)
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  - TA Engineering (General). Civil engineering (General) (48)
  - TD Environmental technology. Sanitary engineering (10)
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  - TP Chemical technology (8)
  - TQ Biomedical technology (7)
  - TR Photography (250)
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  - TX Home economics (4)
- U Military Science (1)
  - U Military Science (General) (1)
- Z Bibliography. Library Science. Information Resources (46)
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  - Z719 Libraries (General) (16)
  - ZA Information resources (22)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (2)