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Library of Congress Subject Areas (57684)
- 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 (4183)
  - B Philosophy (General) (170)
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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 (1174)
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- H Social Sciences (11770)
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- L Education (18472)
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- M Music and Books on Music (21)
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- N Fine Arts (629)
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- P Language and Literature (3217)
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- Q Science (3329)
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- R Medicine (8585)
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  - RM Therapeutics. Pharmacology (1283)
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- S Agriculture (84)
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  - SH Aquaculture. Fisheries. Angling (9)
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- T Technology (5224)
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  - TA Engineering (General). Civil engineering (General) (1186)
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  - TH Building construction (271)
  - TJ Mechanical engineering and machinery (1075)
  - TK Electrical engineering. Electronics Nuclear engineering (736)
  - TL Motor vehicles. Aeronautics. Astronautics (91)
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  - TX Home economics (72)
- 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 (703)
- Z Bibliography. Library Science. Information Resources (87)
  - Z004 Books. Writing. Paleography (7)
  - Z665 Library Science. Information Science (24)
  - Z719 Libraries (General) (11)
  - ZA Information resources (49)
    - ZA4050 Electronic information resources (25)
    - ZA4450 Databases (10)