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Library of Congress Subject Areas (56960)
- A General Works (73)
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  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (46)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (4097)
  - B Philosophy (General) (169)
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- C Auxiliary Sciences of History (11)
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- D History General and Old World (9)
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- E History America (1)
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- G Geography. Anthropology. Recreation (1123)
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- H Social Sciences (11541)
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- L Education (18322)
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- M Music and Books on Music (21)
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- N Fine Arts (606)
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- P Language and Literature (3193)
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- Q Science (3288)
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- R Medicine (8527)
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    - RC1200 Sports Medicine (55)
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  - RM Therapeutics. Pharmacology (1274)
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  - RZ Other systems of medicine (259)
- S Agriculture (83)
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- T Technology (5153)
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  - TA Engineering (General). Civil engineering (General) (1165)
  - TC Hydraulic engineering. Ocean engineering (36)
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  - TF Railroad engineering and operation (14)
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  - TH Building construction (269)
  - TJ Mechanical engineering and machinery (1065)
  - TK Electrical engineering. Electronics Nuclear engineering (714)
  - TL Motor vehicles. Aeronautics. Astronautics (89)
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  - TP Chemical technology (462)
  - TR Photography (8)
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  - TT Handicrafts Arts and crafts (24)
  - TX Home economics (70)
- U Military Science (3)
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- V Naval Science (16)
  - V Naval Science (General) (13)
  - VM Naval architecture. Shipbuilding. Marine engineering (3)
- X General Subject (697)
- Z Bibliography. Library Science. Information Resources (86)
  - Z004 Books. Writing. Paleography (7)
  - Z665 Library Science. Information Science (24)
  - Z719 Libraries (General) (10)
  - ZA Information resources (49)
    - ZA4050 Electronic information resources (25)
    - ZA4450 Databases (10)