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Library of Congress Subject Areas (32100)
- A General Works (105)
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  - AM Museums (General). Collectors and collecting (General) (5)
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- B Philosophy. Psychology. Religion (1001)
  - B Philosophy (General) (33)
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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)
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- G Geography. Anthropology. Recreation (740)
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- H Social Sciences (2241)
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- L Education (1076)
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- M Music and Books on Music (30)
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- N Fine Arts (119)
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- P Language and Literature (520)
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- Q Science (12058)
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- R Medicine (9449)
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  - RB Pathology (160)
    - General works (6)
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  - RC Internal medicine (714)
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    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (124)
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  - RD Surgery (235)
  - RE Ophthalmology (81)
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  - RG Gynecology and obstetrics (106)
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      - Mental disorders. Child psychiatry (4)
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  - RK Dentistry (1138)
    - Practice of dentistry. Dental economics (55)
    - Oral surgery (146)
    - Preventive dentistry (12)
  - RL Dermatology (26)
    - Pathological anatomy (3)
  - RM Therapeutics. Pharmacology (352)
    - Drug prescribing (2)
  - RS Pharmacy and materia medica (269)
    - Pharmacopoeia (6)
  - RT Nursing (85)
    - Specialties in nursing (1)
  - RV Botanic, Thomsonian, and eclectic medicine (35)
  - RX Homeopathy (15)
    - Diseases, treatment, etc (10)
    - Materia medica and therapeutic (3)
  - RZ Other systems of medicine (28)
    - Mental healing (8)
    - Osteopathy (2)
- S Agriculture (362)
  - S Agriculture (General) (248)
  - SB Plant culture (51)
  - SD Forestry (19)
  - SF Animal culture (20)
  - SH Aquaculture. Fisheries. Angling (44)
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- T Technology (8780)
  - T Technology (General) (1955)
  - TA Engineering (General). Civil engineering (General) (3428)
  - TC Hydraulic engineering. Ocean engineering (23)
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  - TE Highway engineering. Roads and pavements (7)
  - TG Bridge engineering (2)
  - TH Building construction (356)
  - TJ Mechanical engineering and machinery (1589)
  - TK Electrical engineering. Electronics Nuclear engineering (2320)
  - TL Motor vehicles. Aeronautics. Astronautics (38)
  - TN Mining engineering. Metallurgy (23)
  - TP Chemical technology (1117)
  - TR Photography (6)
  - TS Manufactures (178)
  - TX Home economics (18)
- U Military Science (3)
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- V Naval Science (5)
  - V Naval Science (General) (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (4)
- Z Bibliography. Library Science. Information Resources (581)
  - Books (General). Writing. Paleography (8)
  - Information resources (General) (48)
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  - Libraries (270)
    - Collections (50)
    - Library science. Information science (88)
  - Libraries (General) (46)