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Library of Congress Subject Areas (16766)
- 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 (1851)
  - B Philosophy (General) (26)
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  - BF Psychology (1765)
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- C Auxiliary Sciences of History (6)
  - C Auxiliary sciences of history (General) (1)
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- D History General and Old World (177)
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  - DA Great Britain (34)
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  - DE The Mediterranean Region. The Greco-Roman World (6)
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- E History America (25)
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- F History United States, Canada, Latin America (29)
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- G Geography. Anthropology. Recreation (401)
  - G Geography (General) (47)
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- H Social Sciences (5216)
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- J Political Science (812)
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- K Law (679)
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- L Education (355)
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  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (525)
  - M Music (312)
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- N Fine Arts (133)
  - N Visual arts (General) For photography, see TR (22)
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- P Language and Literature (900)
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- Q Science (3245)
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  - QH Natural history (110)
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  - QR Microbiology (150)
    - QR180 Immunology (58)
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- R Medicine (4045)
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  - RA Public aspects of medicine (999)
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  - RB Pathology (8)
  - RC Internal medicine (1349)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (80)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (654)
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  - RD Surgery (21)
  - RE Ophthalmology (577)
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    - RJ101 Child Health. Child health services (92)
  - RK Dentistry (3)
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  - RS Pharmacy and materia medica (9)
  - RT Nursing (538)
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  - RZ Other systems of medicine (35)
- S Agriculture (63)
  - S Agriculture (General) (26)
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  - SF Animal culture (15)
- T Technology (2650)
  - T Technology (General) (122)
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  - TA Engineering (General). Civil engineering (General) (1145)
  - TC Hydraulic engineering. Ocean engineering (54)
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  - TE Highway engineering. Roads and pavements (8)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (22)
  - TH Building construction (67)
  - TJ Mechanical engineering and machinery (471)
  - TK Electrical engineering. Electronics Nuclear engineering (655)
  - TL Motor vehicles. Aeronautics. Astronautics (273)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (5)
  - TR Photography (6)
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  - TX Home economics (53)
- U Military Science (24)
  - U Military Science (General) (2)
- V Naval Science (16)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (755)
  - Z004 Books. Writing. Paleography (1)
  - Z665 Library Science. Information Science (658)
  - Z719 Libraries (General) (11)
  - ZA Information resources (90)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)