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Library of Congress Subject Areas (60297)
- A General Works (75)
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  - AI Indexes (General) (3)
  - AM Museums (General). Collectors and collecting (General) (7)
  - AS Academies and learned societies (General) (45)
  - AZ History of Scholarship The Humanities (5)
- B Philosophy. Psychology. Religion (4421)
  - B Philosophy (General) (181)
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    - BV1460 Religious Education (40)
- 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 (1408)
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- H Social Sciences (12805)
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- L Education (19351)
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- M Music and Books on Music (22)
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- N Fine Arts (673)
  - N Visual arts (General) For photography, see TR (6)
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- P Language and Literature (3335)
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  - PN Literature (General) (1407)
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- Q Science (3532)
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- R Medicine (8905)
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  - RB Pathology (73)
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    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (41)
    - RC1200 Sports Medicine (70)
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  - RM Therapeutics. Pharmacology (1391)
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  - RV Botanic, Thomsonian, and eclectic medicine (42)
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  - RZ Other systems of medicine (292)
- S Agriculture (91)
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  - SH Aquaculture. Fisheries. Angling (10)
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- T Technology (5511)
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  - TA Engineering (General). Civil engineering (General) (1244)
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  - TE Highway engineering. Roads and pavements (59)
  - TF Railroad engineering and operation (16)
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  - TH Building construction (290)
  - TJ Mechanical engineering and machinery (1123)
  - TK Electrical engineering. Electronics Nuclear engineering (834)
  - TL Motor vehicles. Aeronautics. Astronautics (98)
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  - TP Chemical technology (477)
  - TR Photography (8)
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  - TT Handicrafts Arts and crafts (25)
  - TX Home economics (73)
- U Military Science (4)
  - U Military Science (General) (4)
- V Naval Science (15)
  - V Naval Science (General) (12)
  - VM Naval architecture. Shipbuilding. Marine engineering (3)
- X General Subject (699)
- Z Bibliography. Library Science. Information Resources (94)
  - Z004 Books. Writing. Paleography (7)
  - Z665 Library Science. Information Science (25)
  - Z719 Libraries (General) (12)
  - ZA Information resources (54)
    - ZA4050 Electronic information resources (28)
    - ZA4450 Databases (14)