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Library of Congress Subject Areas (22167)
- A General Works (256)
  - AC Collections. Series. Collected works (106)
  - AI Indexes (General) (48)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (116)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (259)
  - B Philosophy (General) (16)
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- C Auxiliary Sciences of History (21)
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- D History General and Old World (39)
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- E History America (32)
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- F History United States, Canada, Latin America (9)
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- G Geography. Anthropology. Recreation (93)
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- H Social Sciences (8329)
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- J Political Science (1610)
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- K Law (2913)
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- L Education (990)
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  - LD Individual institutions (United States) (3)
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- M Music and Books on Music (51)
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- N Fine Arts (72)
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- P Language and Literature (49)
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- Q Science (2803)
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- R Medicine (5570)
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  - RB Pathology (240)
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  - RD Surgery (92)
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  - RM Therapeutics. Pharmacology (332)
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  - RT Nursing (1813)
  - RV Botanic, Thomsonian, and eclectic medicine (84)
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  - RZ Other systems of medicine (406)
- S Agriculture (88)
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  - SH Aquaculture. Fisheries. Angling (8)
- T Technology (2115)
  - T Technology (General) (980)
    - T201 Patents. Trademarks (9)
  - TA Engineering (General). Civil engineering (General) (515)
  - TC Hydraulic engineering. Ocean engineering (16)
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  - TE Highway engineering. Roads and pavements (4)
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  - TH Building construction (53)
  - TJ Mechanical engineering and machinery (412)
  - TK Electrical engineering. Electronics Nuclear engineering (135)
  - TL Motor vehicles. Aeronautics. Astronautics (67)
  - TN Mining engineering. Metallurgy (17)
  - TP Chemical technology (28)
  - TR Photography (15)
  - TS Manufactures (362)
  - TT Handicrafts Arts and crafts (8)
  - TX Home economics (59)
- U Military Science (90)
  - U Military Science (General) (90)
- V Naval Science (234)
  - V Naval Science (General) (186)
  - VM Naval architecture. Shipbuilding. Marine engineering (190)
- Z Bibliography. Library Science. Information Resources (369)
  - Z004 Books. Writing. Paleography (22)
  - Z665 Library Science. Information Science (112)
  - Z719 Libraries (General) (144)
  - ZA Information resources (147)
    - ZA4050 Electronic information resources (75)
    - ZA4450 Databases (56)