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Library of Congress Subject Areas (13827)
- A General Works (6)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1450)
  - B Philosophy (General) (16)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (114)
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    - D839 Post-war History, 1945 on (3)
    - D901 Europe (General) (4)
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  - DE The Mediterranean Region. The Greco-Roman World (5)
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- E History America (19)
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- F History United States, Canada, Latin America (20)
  - F1201 Latin America (General) (18)
- G Geography. Anthropology. Recreation (252)
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- H Social Sciences (4136)
  - H Social Sciences (General) (83)
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  - HQ The family. Marriage. Woman (122)
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- J Political Science (576)
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  - JV Colonies and colonization. Emigration and immigration. International migration (63)
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- K Law (546)
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- L Education (281)
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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 (461)
  - M Music (277)
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  - MT Musical instruction and study (12)
- N Fine Arts (98)
  - N Visual arts (General) For photography, see TR (18)
  - NB Sculpture (1)
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- P Language and Literature (748)
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- Q Science (2549)
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- R Medicine (2988)
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  - RA Public aspects of medicine (623)
    - RA0421 Public health. Hygiene. Preventive Medicine (172)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (3)
  - RC Internal medicine (910)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (47)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (380)
    - RC1200 Sports Medicine (1)
  - RD Surgery (14)
  - RE Ophthalmology (445)
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  - RK Dentistry (3)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (16)
  - RS Pharmacy and materia medica (3)
  - RT Nursing (334)
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  - RZ Other systems of medicine (32)
- S Agriculture (47)
  - S Agriculture (General) (21)
  - SB Plant culture (5)
  - SD Forestry (1)
  - SF Animal culture (11)
- T Technology (2108)
  - T Technology (General) (100)
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  - TA Engineering (General). Civil engineering (General) (1002)
  - TC Hydraulic engineering. Ocean engineering (41)
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  - TE Highway engineering. Roads and pavements (7)
  - TF Railroad engineering and operation (3)
  - TG Bridge engineering (19)
  - TH Building construction (52)
  - TJ Mechanical engineering and machinery (321)
  - TK Electrical engineering. Electronics Nuclear engineering (495)
  - TL Motor vehicles. Aeronautics. Astronautics (172)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (3)
  - TR Photography (6)
  - TX Home economics (15)
- U Military Science (20)
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- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (692)
  - Z665 Library Science. Information Science (607)
  - Z719 Libraries (General) (11)
  - ZA Information resources (77)
    - ZA4050 Electronic information resources (63)
    - ZA4450 Databases (9)