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Library of Congress Subject Areas (3221)
- A General Works (71)
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  - AI Indexes (General) (18)
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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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- D History General and Old World (1)
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    - D051 Ancient History (1)
- E History America (1)
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- F History United States, Canada, Latin America (3)
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- G Geography. Anthropology. Recreation (2)
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- H Social Sciences (999)
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    - HF5601 Accounting (839)
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- K Law (3)
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- L Education (82)
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- M Music and Books on Music (1)
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- N Fine Arts (53)
  - N Visual arts (General) For photography, see TR (36)
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- Q Science (474)
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- R Medicine (697)
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- S Agriculture (14)
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- T Technology (989)
  - T Technical Information (358)
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      - A General Works (71)
        AC Collections. Series. Collected works (12)
        AI Indexes (General) (18)
        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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- Z Bibliography. Library Science. Information Resources (8)
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    - ZA4050 Electronic information resources (1)
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