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Library of Congress Subject Areas (19348)
- A General Works (243)
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  - AI Indexes (General) (24)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (142)
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- B Philosophy. Psychology. Religion (414)
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- C Auxiliary Sciences of History (2)
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- D History General and Old World (41)
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- G Geography. Anthropology. Recreation (440)
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- H Social Sciences (2369)
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  - HQ The family. Marriage. Woman (44)
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- J Political Science (134)
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- K Law (12)
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- L Education (2345)
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- M Music and Books on Music (10)
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- N Fine Arts (24)
  - N Visual arts (General) For photography, see TR (6)
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- P Language and Literature (258)
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- Q Science (3462)
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- R Medicine (153)
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- S Agriculture (101)
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- T Technology (11841)
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  - TH Building construction (190)
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  - TK Electrical engineering. Electronics Nuclear engineering (1546)
  - TL Motor vehicles. Aeronautics. Astronautics (343)
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  - TP Chemical technology (3018)
  - TR Photography (9)
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- U Military Science (14)
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- V Naval Science (6)
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  - VM Naval architecture. Shipbuilding. Marine engineering (4)
- Z Bibliography. Library Science. Information Resources (106)
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  - Z719 Libraries (General) (28)
  - ZA Information resources (22)
    - ZA4050 Electronic information resources (9)
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