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Library of Congress Subject Areas (3255)
- A General Works (73)
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    - Hotels Industry (34)
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- B Philosophy. Psychology. Religion (5)
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- C Auxiliary Sciences of History (3)
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- G Geography. Anthropology. Recreation (2)
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- N Fine Arts (53)
  - N Visual arts (General) For photography, see TR (36)
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- S Agriculture (15)
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- T Technology (1012)
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      - A General Works (73)
        AC Collections. Series. Collected works (12)
        AI Indexes (General) (20)
        AM Museums (General). Collectors and collecting (General) (1)
        AS Academies and learned societies (General) (40)
        Hotels Industry (34)
        AZ History of Scholarship The Humanities (1)
  - TA Engineering (General). Civil engineering (General) (116)
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