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Library of Congress Subject Areas (23)
- A General Works (15)
  - AC Collections. Series. Collected works (20)
  - AI Indexes (General) (37)
  - AM Museums (General). Collectors and collecting (General) (2)
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- B Philosophy. Psychology. Religion (1)
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- C Auxiliary Sciences of History (1)
  - C Auxiliary sciences of history (General) (1)
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- D History General and Old World (2)
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    - D051 Ancient History (2)
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- G Geography. Anthropology. Recreation (3)
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- H Social Sciences (23)
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    - HD28 Management. Industrial Management (42)
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  - HN Social history and conditions. Social problems. Social reform (32)
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- J Political Science (22)
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- L Education (6)
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  - LE Individual institutions (America except United States) (1)
  - LG Individual institutions (Asia. Africa) (1)
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- N Fine Arts (17)
  - N Visual arts (General) For photography, see TR (25)
  - NA Architecture (27)
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- P Language and Literature (1)
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- Q Science (89)
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    - QA76 Computer software (89)
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- R Medicine (5)
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    - RA0421 Public health. Hygiene. Preventive Medicine (2)
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  - RZ Other systems of medicine (5)
- S Agriculture (14)
  - S Agriculture (General) (14)
  - SB Plant culture (8)
  - SD Forestry (1)
  - SF Animal culture (3)
- T Technology (3)
  - T Technology (General) (148)
    - T201 Patents. Trademarks (6)
  - TA Engineering (General). Civil engineering (General) (143)
  - TC Hydraulic engineering. Ocean engineering (2)
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  - TE Highway engineering. Roads and pavements (4)
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  - TR Photography (2)
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- U Military Science (1)
  - U Military Science (General) (1)
- Z Bibliography. Library Science. Information Resources (3)
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  - Z665 Library Science. Information Science (24)
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  - ZA Information resources (13)
    - ZA4050 Electronic information resources (6)
    - ZA4450 Databases (13)