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Library of Congress Subject Areas (4090)
- A General Works (82)
  - AC Collections. Series. Collected works (58)
  - AI Indexes (General) (9)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (17)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (71)
  - B Philosophy (General) (7)
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- C Auxiliary Sciences of History (4)
  - C Auxiliary sciences of history (General) (3)
  - CC Archaeology (1)
- D History General and Old World (1)
  - D History (General) (1)
- E History America (1)
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- G Geography. Anthropology. Recreation (9)
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- H Social Sciences (39)
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  - HV Social pathology. Social and public welfare (2)
- K Law (17)
  - K Law (General) (17)
- L Education (289)
  - L Education (General) (180)
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  - LB Theory and practice of education (98)
    - LB1501 Primary Education (13)
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  - LC Special aspects of education (17)
    - LC5201 Education extension. Adult education. Continuing education (2)
  - LD Individual institutions (United States) (1)
  - 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 (5)
  - PK Indo-Iranian (1)
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- Q Science (300)
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  - QH Natural history (63)
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  - QR Microbiology (105)
    - QR180 Immunology (11)
    - QR355 Virology (8)
- R Medicine (3501)
  - R Medicine (General) (546)
  - RA Public aspects of medicine (602)
    - RA0421 Public health. Hygiene. Preventive Medicine (546)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RB Pathology (93)
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    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (2)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1)
    - RC1200 Sports Medicine (1)
  - RD Surgery (32)
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  - RG Gynecology and obstetrics (673)
  - RJ Pediatrics (373)
    - RJ101 Child Health. Child health services (57)
  - RK Dentistry (895)
  - RL Dermatology (5)
  - RM Therapeutics. Pharmacology (31)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (732)
  - RV Botanic, Thomsonian, and eclectic medicine (5)
  - RX Homeopathy (6)
  - RZ Other systems of medicine (65)
- S Agriculture (11)
  - S Agriculture (General) (8)
  - SB Plant culture (3)
- T Technology (63)
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  - TD Environmental technology. Sanitary engineering (39)
  - TP Chemical technology (16)
  - TR Photography (2)
- Z Bibliography. Library Science. Information Resources (103)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (10)
  - Z719 Libraries (General) (51)
  - ZA Information resources (42)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases (37)