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Library of Congress Subject Areas (3992)
- A General Works (37)
  - AC Collections. Series. Collected works (17)
  - 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 (5)
- B Philosophy. Psychology. Religion (114)
  - B Philosophy (General) (32)
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- D History General and Old World (65)
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    - D839 Post-war History, 1945 on (3)
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- E History America (9)
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- F History United States, Canada, Latin America (4)
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- G Geography. Anthropology. Recreation (67)
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- H Social Sciences (1013)
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- J Political Science (45)
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- K Law (58)
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- L Education (936)
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    - LC5201 Education extension. Adult education. Continuing education (81)
  - LG Individual institutions (Asia. Africa) (9)
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- M Music and Books on Music (602)
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- N Fine Arts (660)
  - N Visual arts (General) For photography, see TR (409)
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- P Language and Literature (219)
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    - P Philology. Linguistics (43)
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- Q Science (475)
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- R Medicine (318)
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  - RT Nursing (169)
  - RZ Other systems of medicine (47)
- S Agriculture (43)
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  - SH Aquaculture. Fisheries. Angling (3)
  - SK Hunting sports (2)
- T Technology (525)
  - T Technology (General) (152)
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  - TA Engineering (General). Civil engineering (General) (51)
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  - TJ Mechanical engineering and machinery (60)
  - TK Electrical engineering. Electronics Nuclear engineering (34)
  - TL Motor vehicles. Aeronautics. Astronautics (7)
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  - TP Chemical technology (8)
  - TQ Biomedical technology (13)
  - TR Photography (256)
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  - TX Home economics (4)
- U Military Science (1)
  - U Military Science (General) (1)
- Z Bibliography. Library Science. Information Resources (45)
  - Z004 Books. Writing. Paleography (1)
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  - Z719 Libraries (General) (16)
  - ZA Information resources (21)
    - ZA4050 Electronic information resources (15)
    - ZA4450 Databases (3)