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Library of Congress Subject Areas (31950)
- A General Works (105)
  - AC Collections. Series. Collected works (50)
  - AI Indexes (General) (3)
  - AM Museums (General). Collectors and collecting (General) (5)
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- B Philosophy. Psychology. Religion (999)
  - B Philosophy (General) (33)
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    - Islam (345)
      - General (16)
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  - BV Practical Theology (2)
    - BV1460 Religious Education (2)
- C Auxiliary Sciences of History (8)
  - C Auxiliary sciences of history (General) (3)
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- D History General and Old World (157)
  - D History (General) (38)
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- G Geography. Anthropology. Recreation (729)
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- H Social Sciences (2235)
  - H Social Sciences (General) (688)
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  - HB Economic Theory (279)
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  - HC Economic History and Conditions (307)
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- K Law (223)
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- L Education (1073)
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- M Music and Books on Music (30)
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- N Fine Arts (119)
  - N Visual arts (General) For photography, see TR (21)
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- P Language and Literature (520)
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- Q Science (11998)
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    - QH301 Biology (904)
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- R Medicine (9394)
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    - Medical technology (133)
  - RA Public aspects of medicine (592)
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  - RB Pathology (160)
    - General works (6)
    - Theories of disease. Etiology. Pathogenesis (34)
  - RC Internal medicine (704)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (200)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (122)
    - RC1200 Sports Medicine (63)
    - RC306-320.5 Tuberculosis (5)
  - RD Surgery (231)
  - RE Ophthalmology (80)
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  - RF Otorhinolaryngology (79)
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  - RG Gynecology and obstetrics (106)
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      - Pregnanc (1)
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      - Mental disorders. Child psychiatry (4)
    - Genetic aspect (2)
    - Hospital care (1)
  - RK Dentistry (1132)
    - Practice of dentistry. Dental economics (55)
    - Oral surgery (146)
    - Preventive dentistry (11)
  - RL Dermatology (26)
    - Pathological anatomy (3)
  - RM Therapeutics. Pharmacology (345)
    - Drug prescribing (2)
  - RS Pharmacy and materia medica (261)
    - Pharmacopoeia (6)
  - RT Nursing (84)
    - Specialties in nursing (1)
  - RV Botanic, Thomsonian, and eclectic medicine (35)
  - RX Homeopathy (14)
    - Diseases, treatment, etc (9)
    - Materia medica and therapeutic (3)
  - RZ Other systems of medicine (28)
    - Mental healing (8)
    - Osteopathy (2)
- S Agriculture (357)
  - S Agriculture (General) (247)
  - SB Plant culture (51)
  - SD Forestry (19)
  - SF Animal culture (19)
  - SH Aquaculture. Fisheries. Angling (41)
  - SK Hunting sports (2)
- T Technology (8728)
  - T Technology (General) (1940)
  - TA Engineering (General). Civil engineering (General) (3421)
  - TC Hydraulic engineering. Ocean engineering (23)
  - TD Environmental technology. Sanitary engineering (216)
  - TE Highway engineering. Roads and pavements (7)
  - TG Bridge engineering (2)
  - TH Building construction (354)
  - TJ Mechanical engineering and machinery (1580)
  - TK Electrical engineering. Electronics Nuclear engineering (2299)
  - TL Motor vehicles. Aeronautics. Astronautics (38)
  - TN Mining engineering. Metallurgy (23)
  - TP Chemical technology (1114)
  - TR Photography (6)
  - TS Manufactures (178)
  - TX Home economics (18)
- U Military Science (3)
  - U Military Science (General) (3)
- V Naval Science (5)
  - V Naval Science (General) (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (4)
- Z Bibliography. Library Science. Information Resources (580)
  - Books (General). Writing. Paleography (8)
  - Information resources (General) (48)
    - Information services. Information centers (14)
  - Libraries (270)
    - Collections (50)
    - Library science. Information science (88)
  - Libraries (General) (46)