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Library of Congress Subject Areas (3526)
- A General Works (79)
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  - AI Indexes (General) (21)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (44)
    - Hotels Industry (37)
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- B Philosophy. Psychology. Religion (5)
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- C Auxiliary Sciences of History (5)
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- D History General and Old World (1)
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    - D051 Ancient History (1)
- E History America (1)
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- G Geography. Anthropology. Recreation (3)
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- H Social Sciences (1105)
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- J Political Science (7)
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- K Law (3)
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- L Education (95)
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- M Music and Books on Music (2)
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- N Fine Arts (58)
  - N Visual arts (General) For photography, see TR (41)
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- Q Science (498)
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- R Medicine (756)
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- S Agriculture (17)
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- T Technology (1114)
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      - A General Works (79)
        AC Collections. Series. Collected works (13)
        AI Indexes (General) (21)
        AM Museums (General). Collectors and collecting (General) (1)
        AS Academies and learned societies (General) (44)
        Hotels Industry (37)
        AZ History of Scholarship The Humanities (1)
  - TA Engineering (General). Civil engineering (General) (124)
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- Z Bibliography. Library Science. Information Resources (8)
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    - ZA4050 Electronic information resources (1)
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