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Library of Congress Subject Areas (3415)
- A General Works (78)
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  - AI Indexes (General) (20)
  - 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)
- B Philosophy. Psychology. Religion (5)
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- C Auxiliary Sciences of History (5)
  - C Auxiliary sciences of history (General) (1)
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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)
  - F001 United States local history (3)
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- G Geography. Anthropology. Recreation (2)
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- H Social Sciences (1081)
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    - HD28 Management. Industrial Management (2)
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- J Political Science (7)
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- K Law (3)
  - K Law (General) (3)
- L Education (88)
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- M Music and Books on Music (1)
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- N Fine Arts (56)
  - N Visual arts (General) For photography, see TR (39)
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- Q Science (490)
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- R Medicine (734)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
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    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
  - RG Gynecology and obstetrics (87)
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  - RL Dermatology (3)
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  - RV Botanic, Thomsonian, and eclectic medicine (3)
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- S Agriculture (16)
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  - SH Aquaculture. Fisheries. Angling (2)
- T Technology (1051)
  - T Technical Information (377)
    - Technical Information (84)
      - A General Works (78)
        AC Collections. Series. Collected works (13)
        AI Indexes (General) (20)
        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) (122)
  - TC Hydraulic engineering. Ocean engineering (5)
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  - TE Highway engineering. Roads and pavements (5)
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  - TN Mining engineering. Metallurgy (29)
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- U Military Science (1)
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- Z Bibliography. Library Science. Information Resources (8)
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  - ZA Information resources (3)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases (1)