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Library of Congress Subject Areas (17485)
- A General Works (180)
  - AC Collections. Series. Collected works (57)
  - AI Indexes (General) (44)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (92)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (208)
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- C Auxiliary Sciences of History (14)
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- D History General and Old World (23)
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- E History America (23)
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- F History United States, Canada, Latin America (4)
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- G Geography. Anthropology. Recreation (69)
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- H Social Sciences (6693)
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- J Political Science (1193)
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- L Education (756)
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  - LD Individual institutions (United States) (2)
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- M Music and Books on Music (38)
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- N Fine Arts (62)
  - N Visual arts (General) For photography, see TR (30)
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- P Language and Literature (38)
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- Q Science (2149)
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- R Medicine (4342)
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  - RA Public aspects of medicine (1062)
    - RA0421 Public health. Hygiene. Preventive Medicine (848)
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  - RB Pathology (190)
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    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (21)
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  - RT Nursing (1283)
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  - RZ Other systems of medicine (305)
- S Agriculture (62)
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  - SH Aquaculture. Fisheries. Angling (6)
- T Technology (1635)
  - T Technology (General) (705)
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  - TA Engineering (General). Civil engineering (General) (474)
  - TC Hydraulic engineering. Ocean engineering (8)
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  - TH Building construction (47)
  - TJ Mechanical engineering and machinery (284)
  - TK Electrical engineering. Electronics Nuclear engineering (71)
  - TL Motor vehicles. Aeronautics. Astronautics (50)
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  - TP Chemical technology (14)
  - TR Photography (12)
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  - TX Home economics (44)
- U Military Science (74)
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- V Naval Science (188)
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  - VM Naval architecture. Shipbuilding. Marine engineering (154)
- Z Bibliography. Library Science. Information Resources (313)
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  - Z665 Library Science. Information Science (93)
  - Z719 Libraries (General) (133)
  - ZA Information resources (110)
    - ZA4050 Electronic information resources (60)
    - ZA4450 Databases (42)