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Library of Congress Subject Areas (18305)
- A General Works (185)
  - AC Collections. Series. Collected works (56)
  - AI Indexes (General) (44)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (98)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (225)
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- C Auxiliary Sciences of History (14)
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- D History General and Old World (26)
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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 (71)
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- H Social Sciences (7068)
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- J Political Science (1216)
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- L Education (787)
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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 (43)
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- Q Science (2215)
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- R Medicine (4520)
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  - RA Public aspects of medicine (1078)
    - RA0421 Public health. Hygiene. Preventive Medicine (863)
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  - RB Pathology (192)
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  - RM Therapeutics. Pharmacology (222)
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- S Agriculture (65)
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  - SH Aquaculture. Fisheries. Angling (6)
- T Technology (1700)
  - T Technology (General) (732)
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  - TA Engineering (General). Civil engineering (General) (479)
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  - TH Building construction (48)
  - TJ Mechanical engineering and machinery (313)
  - TK Electrical engineering. Electronics Nuclear engineering (83)
  - TL Motor vehicles. Aeronautics. Astronautics (54)
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  - TR Photography (13)
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  - TX Home economics (49)
- U Military Science (76)
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- V Naval Science (194)
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  - VM Naval architecture. Shipbuilding. Marine engineering (159)
- Z Bibliography. Library Science. Information Resources (324)
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  - Z665 Library Science. Information Science (94)
  - Z719 Libraries (General) (138)
  - ZA Information resources (116)
    - ZA4050 Electronic information resources (62)
    - ZA4450 Databases (45)