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Library of Congress Subject Areas (6783)
- A General Works (32)
  - AC Collections. Series. Collected works (15)
  - AI Indexes (General) (16)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (2)
- B Philosophy. Psychology. Religion (220)
  - B Philosophy (General) (12)
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  - BL Religion (188)
- C Auxiliary Sciences of History (1)
  - C Auxiliary sciences of history (General) (1)
- D History General and Old World (1)
  - D History (General) (1)
- G Geography. Anthropology. Recreation (3)
  - GE Environmental Sciences (3)
- H Social Sciences (68)
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  - HD Industries. Land use. Labor (8)
    - HD28 Management. Industrial Management (8)
    - HD61 Risk Management (4)
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  - K Law (General) (1)
- L Education (187)
  - L Education (General) (179)
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    - LB1501 Primary Education (2)
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  - LC Special aspects of education (3)
    - LC5201 Education extension. Adult education. Continuing education (2)
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- Q Science (305)
  - Q Science (General) (18)
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    - QA75 Electronic computers. Computer science (22)
    - QA76 Computer software (17)
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  - QH Natural history (38)
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  - QM Human anatomy (73)
  - QP Physiology (81)
  - QR Microbiology (66)
    - QR180 Immunology (4)
    - QR355 Virology (5)
- R Medicine (6006)
  - R Medicine (General) (1365)
  - RA Public aspects of medicine (248)
    - RA0421 Public health. Hygiene. Preventive Medicine (202)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (18)
  - RC Internal medicine (129)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (15)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (15)
    - RC1200 Sports Medicine (5)
  - RD Surgery (96)
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  - RG Gynecology and obstetrics (171)
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  - RK Dentistry (941)
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  - RM Therapeutics. Pharmacology (28)
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  - RT Nursing (734)
  - RV Botanic, Thomsonian, and eclectic medicine (2)
  - RX Homeopathy (4)
  - RZ Other systems of medicine (116)
  - RH Basic Medical Sciences (211)
    - RH1001 Biochemistry & Genetics (185)
  - RI Heart (59)
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    - RN1001 Public Health (263)
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    - RN1003 Occupational Health (179)
    - RN1004 Health Care Management (272)
    - RN1005 Health Sciences in Nutrition (264)
    - RN1006 Health and food safety (201)
    - RN1007 MPH (29)
  - RP Paramedical (740)
    - RP101 Operating Room (201)
    - RP102 Anesthesiology (99)
    - RP103 Laboratory Sciences (128)
    - RP104 Medical emergencies (40)
    - RP105 Biotechnology (213)
  - RQ Parasitology (17)
- S Agriculture (7)
  - S Agriculture (General) (5)
  - SF Animal culture (2)
- T Technology (3)
  - T Technology (General) (1)
  - TD Environmental technology. Sanitary engineering (2)
- Z Bibliography. Library Science. Information Resources (7)
  - Z665 Library Science. Information Science (7)