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Library of Congress Subject Areas (76281)
- A General Works (47)
  - AC Collections. Series. Collected works (7)
  - AI Indexes (General) (5)
  - AM Museums (General). Collectors and collecting (General) (25)
  - AS Academies and learned societies (General) (2)
  - AZ History of Scholarship The Humanities (10)
- B Philosophy. Psychology. Religion (4385)
  - B Philosophy (General) (378)
  - BC Logic (5)
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  - BV Practical Theology (2)
    - BV1460 Religious Education (1)
  - BX Christian Denominations (13)
- C Auxiliary Sciences of History (1303)
  - C Auxiliary sciences of history (General) (65)
  - CB History of civilization (30)
  - CC Archaeology (1153)
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- D History General and Old World (1623)
  - D History (General) (790)
    - D051 Ancient History (59)
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- E History America (42)
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- F History United States, Canada, Latin America (63)
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- G Geography. Anthropology. Recreation (8867)
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- H Social Sciences (13033)
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- J Political Science (1683)
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- K Law (1171)
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- L Education (2671)
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- M Music and Books on Music (700)
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- N Fine Arts (840)
  - N Visual arts (General) For photography, see TR (254)
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- P Language and Literature (1399)
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- Q Science (31284)
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    - QR180 Immunology (915)
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- R Medicine (17968)
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  - RA Public aspects of medicine (2191)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (102)
  - RB Pathology (1480)
  - RC Internal medicine (4307)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1630)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1919)
    - RC1200 Sports Medicine (52)
  - RD Surgery (512)
  - RE Ophthalmology (173)
  - RF Otorhinolaryngology (436)
  - RG Gynecology and obstetrics (754)
  - RJ Pediatrics (1092)
    - RJ101 Child Health. Child health services (538)
  - RK Dentistry (25)
  - RL Dermatology (193)
  - RM Therapeutics. Pharmacology (1320)
  - RS Pharmacy and materia medica (194)
  - RT Nursing (2340)
  - RV Botanic, Thomsonian, and eclectic medicine (25)
  - RX Homeopathy (57)
  - RZ Other systems of medicine (418)
- S Agriculture (412)
  - S Agriculture (General) (152)
  - SB Plant culture (103)
  - SD Forestry (46)
  - SF Animal culture (79)
  - SH Aquaculture. Fisheries. Angling (45)
- T Technology (19675)
  - T Technology (General) (1647)
    - T201 Patents. Trademarks (10)
  - TA Engineering (General). Civil engineering (General) (6969)
  - TC Hydraulic engineering. Ocean engineering (482)
  - TD Environmental technology. Sanitary engineering (764)
  - TE Highway engineering. Roads and pavements (299)
  - TF Railroad engineering and operation (182)
  - TG Bridge engineering (23)
  - TH Building construction (140)
  - TJ Mechanical engineering and machinery (872)
  - TK Electrical engineering. Electronics Nuclear engineering (6536)
  - TL Motor vehicles. Aeronautics. Astronautics (1845)
  - TN Mining engineering. Metallurgy (431)
  - TP Chemical technology (547)
  - TR Photography (35)
  - TS Manufactures (181)
  - TT Handicrafts Arts and crafts (101)
  - TX Home economics (1)
- U Military Science (169)
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- V Naval Science (895)
  - V Naval Science (General) (170)
  - VM Naval architecture. Shipbuilding. Marine engineering (772)
- Z Bibliography. Library Science. Information Resources (501)
  - Z004 Books. Writing. Paleography (105)
  - Z665 Library Science. Information Science (122)
  - Z719 Libraries (General) (13)
  - ZA Information resources (272)
    - ZA4050 Electronic information resources (174)
    - ZA4450 Databases (50)