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Library of Congress Subject Areas (4566)
- A General Works (95)
  - AC Collections. Series. Collected works (62)
  - AI Indexes (General) (10)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (26)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (92)
  - B Philosophy (General) (8)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (3)
  - D History (General) (2)
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- E History America (1)
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- G Geography. Anthropology. Recreation (9)
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- H Social Sciences (43)
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  - HQ The family. Marriage. Woman (5)
  - HT Communities. Classes. Races (4)
  - HV Social pathology. Social and public welfare (2)
- K Law (17)
  - K Law (General) (17)
- L Education (527)
  - L Education (General) (372)
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    - LB1501 Primary Education (14)
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  - LC Special aspects of education (32)
    - LC5201 Education extension. Adult education. Continuing education (3)
  - LD Individual institutions (United States) (2)
  - LG Individual institutions (Asia. Africa) (4)
- M Music and Books on Music (3)
  - M Music (3)
- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- P Language and Literature (6)
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- Q Science (319)
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  - QH Natural history (63)
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    - QR180 Immunology (11)
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- R Medicine (3936)
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    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (2)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (2)
    - RC1200 Sports Medicine (1)
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  - RG Gynecology and obstetrics (757)
  - RJ Pediatrics (420)
    - RJ101 Child Health. Child health services (65)
  - RK Dentistry (963)
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  - RM Therapeutics. Pharmacology (38)
  - RS Pharmacy and materia medica (3)
  - RT Nursing (919)
  - RV Botanic, Thomsonian, and eclectic medicine (5)
  - RX Homeopathy (6)
  - RZ Other systems of medicine (74)
- S Agriculture (11)
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  - SB Plant culture (3)
- T Technology (64)
  - T Technology (General) (7)
  - TD Environmental technology. Sanitary engineering (40)
  - TP Chemical technology (16)
  - TR Photography (2)
- Z Bibliography. Library Science. Information Resources (112)
  - Z004 Books. Writing. Paleography (5)
  - Z665 Library Science. Information Science (15)
  - Z719 Libraries (General) (55)
  - ZA Information resources (43)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases (37)