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Library of Congress Subject Areas (20369)
- A General Works (8)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (2375)
  - B Philosophy (General) (38)
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- C Auxiliary Sciences of History (10)
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- D History General and Old World (240)
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- E History America (27)
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- F History United States, Canada, Latin America (39)
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- G Geography. Anthropology. Recreation (532)
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- H Social Sciences (6499)
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- J Political Science (1157)
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- K Law (890)
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- L Education (504)
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- M Music and Books on Music (624)
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- N Fine Arts (156)
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- P Language and Literature (1073)
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- Q Science (3985)
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- R Medicine (5402)
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  - RA Public aspects of medicine (1667)
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  - RB Pathology (8)
  - RC Internal medicine (1800)
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- S Agriculture (87)
  - S Agriculture (General) (44)
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- T Technology (3358)
  - T Technology (General) (214)
    - T201 Patents. Trademarks (2)
  - TA Engineering (General). Civil engineering (General) (1458)
  - TC Hydraulic engineering. Ocean engineering (60)
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  - TH Building construction (178)
  - TJ Mechanical engineering and machinery (601)
  - TK Electrical engineering. Electronics Nuclear engineering (787)
  - TL Motor vehicles. Aeronautics. Astronautics (333)
  - TN Mining engineering. Metallurgy (6)
  - TP Chemical technology (7)
  - TR Photography (7)
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  - TX Home economics (79)
- U Military Science (35)
  - U Military Science (General) (5)
- V Naval Science (32)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (17)
- Z Bibliography. Library Science. Information Resources (804)
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  - Z665 Library Science. Information Science (693)
  - Z719 Libraries (General) (11)
  - ZA Information resources (99)
    - ZA4050 Electronic information resources (71)
    - ZA4450 Databases (10)