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Library of Congress Subject Areas (7572)
- A General Works (1738)
  - AC Collections. Series. Collected works (301)
  - AI Indexes (General) (1451)
  - AM Museums (General). Collectors and collecting (General) (6)
- B Philosophy. Psychology. Religion (223)
  - B Philosophy (General) (2)
  - BC Logic (2)
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  - BJ Ethics (14)
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- G Geography. Anthropology. Recreation (151)
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- H Social Sciences (247)
  - H Social Sciences (General) (2)
  - HA Statistics (31)
  - HB Economic Theory (32)
  - HC Economic History and Conditions (7)
  - HD Industries. Land use. Labor (72)
    - HD28 Management. Industrial Management (72)
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  - HQ The family. Marriage. Woman (7)
  - HV Social pathology. Social and public welfare (101)
- L Education (257)
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    - LB1501 Primary Education (7)
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- Q Science (542)
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    - QA75 Electronic computers. Computer science (17)
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  - QD Chemistry (25)
  - QH Natural history (102)
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  - QM Human anatomy (45)
  - QP Physiology (60)
  - QR Microbiology (206)
    - QR180 Immunology (59)
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- R Medicine (5888)
  - R Medicine (General) (3278)
  - RA Public aspects of medicine (828)
    - RA0421 Public health. Hygiene. Preventive Medicine (504)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (34)
  - RB Pathology (39)
  - RC Internal medicine (770)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (212)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (251)
    - RC1200 Sports Medicine (5)
  - RD Surgery (138)
  - RE Ophthalmology (14)
  - RF Otorhinolaryngology (19)
  - RG Gynecology and obstetrics (225)
  - RJ Pediatrics (288)
    - RJ101 Child Health. Child health services (25)
  - RK Dentistry (614)
  - RL Dermatology (114)
  - RM Therapeutics. Pharmacology (621)
  - RS Pharmacy and materia medica (571)
  - RT Nursing (336)
  - RV Botanic, Thomsonian, and eclectic medicine (126)
  - RZ Other systems of medicine (206)
- 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 (99)
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  - Z719 Libraries (General) (34)
  - ZA Information resources (77)
    - ZA4050 Electronic information resources (67)
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