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Library of Congress Subject Areas (55057)
- A General Works (73)
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  - AI Indexes (General) (4)
  - 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 (3915)
  - B Philosophy (General) (165)
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- C Auxiliary Sciences of History (10)
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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 (1023)
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- H Social Sciences (11059)
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- L Education (17743)
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- M Music and Books on Music (19)
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- N Fine Arts (553)
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- Q Science (3167)
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- R Medicine (8381)
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  - RM Therapeutics. Pharmacology (1266)
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- S Agriculture (80)
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- T Technology (4944)
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  - TA Engineering (General). Civil engineering (General) (1102)
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  - TH Building construction (251)
  - TJ Mechanical engineering and machinery (1024)
  - TK Electrical engineering. Electronics Nuclear engineering (688)
  - TL Motor vehicles. Aeronautics. Astronautics (89)
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  - TP Chemical technology (458)
  - TR Photography (8)
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  - TX Home economics (68)
- U Military Science (3)
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- V Naval Science (15)
  - V Naval Science (General) (12)
  - VM Naval architecture. Shipbuilding. Marine engineering (3)
- X General Subject (671)
- Z Bibliography. Library Science. Information Resources (83)
  - Z004 Books. Writing. Paleography (7)
  - Z665 Library Science. Information Science (21)
  - Z719 Libraries (General) (10)
  - ZA Information resources (49)
    - ZA4050 Electronic information resources (25)
    - ZA4450 Databases (10)