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Library of Congress Subject Areas (4706)
- B Philosophy. Psychology. Religion (327)
  - B Philosophy (General) (20)
  - BF Psychology (5)
  - BP Islam. Bahaism. Theosophy, etc (19)
  - BV Practical Theology (5)
    - BV1460 Religious Education (3)
  - Islamic Studies (287)
  - BC Logic (1)
- C Auxiliary Sciences of History (1)
  - CB History of civilization (1)
- D History General and Old World (1)
  - D History (General) (1)
- G Geography. Anthropology. Recreation (6)
  - G Geography (General) (4)
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- H Social Sciences (1142)
  - H Social Sciences (General) (69)
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  - HB Economic Theory (362)
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  - HD Industries. Land use. Labor (401)
    - HD28 Management. Industrial Management (226)
    - HD61 Risk Management (7)
  - HE Transportation and Communications (117)
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  - HT Communities. Classes. Races (6)
- J Political Science (190)
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  - JA Political science (General) (37)
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  - JS Local government Municipal government (26)
- K Law (119)
  - K Law (General) (119)
- L Education (180)
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    - LB1501 Primary Education (16)
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  - LC Special aspects of education (1)
- N Fine Arts (5)
  - N Visual arts (General) For photography, see TR (1)
  - NX Arts in general (5)
- P Language and Literature (231)
  - P Philology. Linguistics (4)
  - PE English (216)
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- Q Science (397)
  - Q Science (General) (7)
  - QA Mathematics (379)
    - QA75 Electronic computers. Computer science (3)
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  - QM Human anatomy (3)
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- R Medicine (1100)
  - R Medicine (General) (51)
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    - RA0421 Public health. Hygiene. Preventive Medicine (4)
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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 (3)
  - S Agriculture (General) (3)
  - SB Plant culture (1)
- T Technology (1035)
  - T Technology (General) (710)
    - T201 Patents. Trademarks (11)
  - TA Engineering (General). Civil engineering (General) (183)
  - TC Hydraulic engineering. Ocean engineering (3)
  - TJ Mechanical engineering and machinery (91)
  - TK Electrical engineering. Electronics Nuclear engineering (58)
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  - 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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