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Library of Congress Subject Areas (4754)
- B Philosophy. Psychology. Religion (328)
  - B Philosophy (General) (21)
  - BF Psychology (5)
  - BP Islam. Bahaism. Theosophy, etc (19)
  - BV Practical Theology (5)
    - BV1460 Religious Education (3)
  - Islamic Studies (287)
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- C Auxiliary Sciences of History (1)
  - CB History of civilization (1)
- D History General and Old World (2)
  - D History (General) (1)
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- G Geography. Anthropology. Recreation (6)
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- H Social Sciences (1149)
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    - HD28 Management. Industrial Management (226)
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  - HT Communities. Classes. Races (6)
- J Political Science (190)
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- K Law (119)
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- L Education (184)
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- N Fine Arts (6)
  - N Visual arts (General) For photography, see TR (1)
  - NA Architecture (1)
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- P Language and Literature (234)
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- Q Science (398)
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- R Medicine (1106)
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    - RJ101 Child Health. Child health services (2)
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  - RT Nursing (743)
  - RZ Other systems of medicine (1)
- S Agriculture (4)
  - S Agriculture (General) (4)
  - SB Plant culture (1)
- T Technology (1062)
  - T Technology (General) (728)
    - T201 Patents. Trademarks (11)
  - TA Engineering (General). Civil engineering (General) (188)
  - TC Hydraulic engineering. Ocean engineering (3)
  - TJ Mechanical engineering and machinery (92)
  - TK Electrical engineering. Electronics Nuclear engineering (61)
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  - TN Mining engineering. Metallurgy (3)
  - TP Chemical technology (1)
  - TR Photography (1)
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- Z Bibliography. Library Science. Information Resources (4)
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- A General Works (2)
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