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Library of Congress Subject Areas (5541)
- A General Works (564)
  - AC Collections. Series. Collected works (300)
  - AI Indexes (General) (277)
  - AM Museums (General). Collectors and collecting (General) (5)
- B Philosophy. Psychology. Religion (187)
  - B Philosophy (General) (1)
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  - BL Religion (1)
  - BP Islam. Bahaism. Theosophy, etc (1)
- G Geography. Anthropology. Recreation (130)
  - G Geography (General) (1)
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  - GE Environmental Sciences (113)
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- H Social Sciences (194)
  - H Social Sciences (General) (2)
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  - HB Economic Theory (28)
  - HC Economic History and Conditions (7)
  - HD Industries. Land use. Labor (63)
    - HD28 Management. Industrial Management (63)
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  - HQ The family. Marriage. Woman (5)
  - HV Social pathology. Social and public welfare (68)
- L Education (228)
  - L Education (General) (184)
  - LB Theory and practice of education (47)
    - LB1501 Primary Education (7)
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    - LB2300 Higher Education (25)
    - LB2361 Curriculum (1)
- Q Science (459)
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    - QA75 Electronic computers. Computer science (15)
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  - QD Chemistry (13)
  - QH Natural history (74)
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  - QM Human anatomy (39)
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    - QR180 Immunology (58)
    - QR355 Virology (34)
- R Medicine (4896)
  - R Medicine (General) (2939)
  - RA Public aspects of medicine (597)
    - RA0421 Public health. Hygiene. Preventive Medicine (290)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (20)
  - RB Pathology (31)
  - RC Internal medicine (664)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (169)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (219)
    - RC1200 Sports Medicine (5)
  - RD Surgery (109)
  - RE Ophthalmology (12)
  - RF Otorhinolaryngology (18)
  - RG Gynecology and obstetrics (194)
  - RJ Pediatrics (242)
    - RJ101 Child Health. Child health services (23)
  - RK Dentistry (453)
  - RL Dermatology (101)
  - RM Therapeutics. Pharmacology (549)
  - RS Pharmacy and materia medica (446)
  - RT Nursing (290)
  - RV Botanic, Thomsonian, and eclectic medicine (60)
  - RZ Other systems of medicine (183)
- S Agriculture (4)
  - SB Plant culture (2)
  - SF Animal culture (2)
- T Technology (42)
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    - T201 Patents. Trademarks (1)
  - TC Hydraulic engineering. Ocean engineering (1)
  - TD Environmental technology. Sanitary engineering (30)
  - TH Building construction (4)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
- Z Bibliography. Library Science. Information Resources (73)
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  - Z719 Libraries (General) (26)
  - ZA Information resources (52)
    - ZA4050 Electronic information resources (44)
    - ZA4450 Databases (29)