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Library of Congress Subject Areas (1850)
- A General Works (52)
  - AC Collections. Series. Collected works (40)
  - AI Indexes (General) (3)
  - AS Academies and learned societies (General) (9)
  - AZ History of Scholarship The Humanities (2)
- B Philosophy. Psychology. Religion (33)
  - B Philosophy (General) (2)
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  - BL Religion (2)
- C Auxiliary Sciences of History (2)
  - C Auxiliary sciences of history (General) (1)
  - CC Archaeology (1)
- E History America (1)
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- G Geography. Anthropology. Recreation (4)
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  - GE Environmental Sciences (1)
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- H Social Sciences (16)
  - H Social Sciences (General) (10)
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  - HV Social pathology. Social and public welfare (1)
- L Education (150)
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    - LB1501 Primary Education (8)
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    - LB2300 Higher Education (9)
  - LC Special aspects of education (1)
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  - LG Individual institutions (Asia. Africa) (3)
- 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 (1)
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- Q Science (101)
  - Q Science (General) (39)
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  - QH Natural history (6)
    - QH301 Biology (5)
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  - QM Human anatomy (6)
  - QP Physiology (6)
  - QR Microbiology (36)
    - QR180 Immunology (1)
    - QR355 Virology (2)
- R Medicine (1615)
  - R Medicine (General) (303)
  - RA Public aspects of medicine (291)
    - RA0421 Public health. Hygiene. Preventive Medicine (258)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RB Pathology (55)
  - RC Internal medicine (120)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
    - RC1200 Sports Medicine (1)
  - RD Surgery (23)
  - RF Otorhinolaryngology (1)
  - RG Gynecology and obstetrics (363)
  - RJ Pediatrics (100)
    - RJ101 Child Health. Child health services (32)
  - RK Dentistry (344)
  - RL Dermatology (4)
  - RM Therapeutics. Pharmacology (4)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (373)
  - RV Botanic, Thomsonian, and eclectic medicine (2)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (36)
- S Agriculture (7)
  - S Agriculture (General) (6)
  - SB Plant culture (1)
- T Technology (31)
  - T Technology (General) (5)
  - TD Environmental technology. Sanitary engineering (24)
  - TP Chemical technology (1)
  - TR Photography (1)
- Z Bibliography. Library Science. Information Resources (39)
  - Z665 Library Science. Information Science (4)
  - Z719 Libraries (General) (16)
  - ZA Information resources (20)
    - ZA4450 Databases (18)