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Library of Congress Subject Areas (14720)
- A General Works (7)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1565)
  - B Philosophy (General) (20)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (133)
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    - D901 Europe (General) (4)
  - DA Great Britain (31)
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  - DE The Mediterranean Region. The Greco-Roman World (5)
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- E History America (20)
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- F History United States, Canada, Latin America (23)
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- G Geography. Anthropology. Recreation (290)
  - G Geography (General) (47)
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  - GV Recreation Leisure (12)
- H Social Sciences (4443)
  - H Social Sciences (General) (84)
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  - HB Economic Theory (654)
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  - HQ The family. Marriage. Woman (128)
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- J Political Science (661)
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- K Law (586)
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- L Education (305)
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  - LC Special aspects of education (10)
    - LC5201 Education extension. Adult education. Continuing education (6)
  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (472)
  - M Music (281)
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  - MT Musical instruction and study (14)
- N Fine Arts (105)
  - N Visual arts (General) For photography, see TR (19)
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- P Language and Literature (802)
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- Q Science (2733)
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  - QH Natural history (90)
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- R Medicine (3240)
  - R Medicine (General) (198)
  - RA Public aspects of medicine (680)
    - RA0421 Public health. Hygiene. Preventive Medicine (211)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (4)
  - RC Internal medicine (1019)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (53)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (456)
    - RC1200 Sports Medicine (1)
  - RD Surgery (17)
  - RE Ophthalmology (487)
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  - RG Gynecology and obstetrics (290)
  - RJ Pediatrics (191)
    - RJ101 Child Health. Child health services (74)
  - RK Dentistry (3)
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  - RM Therapeutics. Pharmacology (20)
  - RS Pharmacy and materia medica (6)
  - RT Nursing (356)
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  - RZ Other systems of medicine (32)
- S Agriculture (52)
  - S Agriculture (General) (22)
  - SB Plant culture (6)
  - SD Forestry (1)
  - SF Animal culture (12)
- T Technology (2296)
  - T Technology (General) (107)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1038)
  - TC Hydraulic engineering. Ocean engineering (44)
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  - TE Highway engineering. Roads and pavements (7)
  - TF Railroad engineering and operation (5)
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  - TH Building construction (58)
  - TJ Mechanical engineering and machinery (383)
  - TK Electrical engineering. Electronics Nuclear engineering (553)
  - TL Motor vehicles. Aeronautics. Astronautics (196)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (3)
  - TR Photography (6)
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  - TX Home economics (27)
- U Military Science (22)
  - U Military Science (General) (2)
- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (713)
  - Z665 Library Science. Information Science (622)
  - Z719 Libraries (General) (11)
  - ZA Information resources (84)
    - ZA4050 Electronic information resources (66)
    - ZA4450 Databases (10)