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Library of Congress Subject Areas (19286)
- A General Works (8)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (2244)
  - B Philosophy (General) (37)
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- C Auxiliary Sciences of History (9)
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    - CD921 Archives (3)
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- D History General and Old World (208)
  - D History (General) (44)
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    - D901 Europe (General) (6)
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  - DE The Mediterranean Region. The Greco-Roman World (7)
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- E History America (25)
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- F History United States, Canada, Latin America (37)
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- G Geography. Anthropology. Recreation (500)
  - G Geography (General) (50)
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- H Social Sciences (6111)
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- J Political Science (1073)
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- K Law (838)
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- L Education (459)
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  - LC Special aspects of education (21)
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  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (567)
  - M Music (342)
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- N Fine Arts (142)
  - N Visual arts (General) For photography, see TR (22)
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- P Language and Literature (1025)
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- Q Science (3758)
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    - QA75 Electronic computers. Computer science (1776)
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  - QB Astronomy (12)
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  - QH Natural history (132)
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- R Medicine (5019)
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  - RA Public aspects of medicine (1507)
    - RA0421 Public health. Hygiene. Preventive Medicine (840)
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  - RB Pathology (8)
  - RC Internal medicine (1661)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (98)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (837)
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  - RD Surgery (24)
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  - RJ Pediatrics (347)
    - RJ101 Child Health. Child health services (148)
  - RK Dentistry (3)
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  - RM Therapeutics. Pharmacology (55)
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  - RT Nursing (661)
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  - RZ Other systems of medicine (50)
- S Agriculture (79)
  - S Agriculture (General) (36)
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  - SF Animal culture (16)
- T Technology (3169)
  - T Technology (General) (179)
    - T201 Patents. Trademarks (2)
  - TA Engineering (General). Civil engineering (General) (1383)
  - TC Hydraulic engineering. Ocean engineering (58)
  - TD Environmental technology. Sanitary engineering (25)
  - TE Highway engineering. Roads and pavements (10)
  - TF Railroad engineering and operation (7)
  - TG Bridge engineering (27)
  - TH Building construction (158)
  - TJ Mechanical engineering and machinery (573)
  - TK Electrical engineering. Electronics Nuclear engineering (748)
  - TL Motor vehicles. Aeronautics. Astronautics (323)
  - TN Mining engineering. Metallurgy (4)
  - TP Chemical technology (7)
  - TR Photography (6)
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  - TX Home economics (77)
- U Military Science (35)
  - U Military Science (General) (5)
- V Naval Science (25)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (13)
- Z Bibliography. Library Science. Information Resources (788)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (685)
  - Z719 Libraries (General) (11)
  - ZA Information resources (92)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)