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Library of Congress Subject Areas (4393)
- B Philosophy. Psychology. Religion (219)
  - B Philosophy (General) (1)
  - BF Psychology (216)
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- C Auxiliary Sciences of History (1)
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- D History General and Old World (7)
  - D History (General) (7)
- G Geography. Anthropology. Recreation (89)
  - G Geography (General) (79)
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  - GV Recreation Leisure (3)
- H Social Sciences (1350)
  - H Social Sciences (General) (451)
  - HB Economic Theory (374)
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    - HD28 Management. Industrial Management (3)
    - HD61 Risk Management (1)
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- L Education (683)
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    - LB2361 Curriculum (2)
  - LC Special aspects of education (1)
- M Music and Books on Music (7)
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  - ML Literature of music (4)
- N Fine Arts (3)
  - N Visual arts (General) For photography, see TR (2)
  - NX Arts in general (1)
- P Language and Literature (969)
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  - PQ Romance literatures (6)
- Q Science (752)
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  - QA Mathematics (746)
    - QA75 Electronic computers. Computer science (388)
    - QA76 Computer software (92)
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- R Medicine (39)
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- S Agriculture (91)
  - S Agriculture (General) (86)
  - SB Plant culture (3)
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  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (306)
  - T Technology (General) (59)
  - TA Engineering (General). Civil engineering (General) (152)
  - TC Hydraulic engineering. Ocean engineering (2)
  - TD Environmental technology. Sanitary engineering (8)
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  - TK Electrical engineering. Electronics Nuclear engineering (59)
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- Z Bibliography. Library Science. Information Resources (95)
  - Z004 Books. Writing. Paleography (84)
  - Z665 Library Science. Information Science (9)
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