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Library of Congress Subject Areas (4430)
- B Philosophy. Psychology. Religion (219)
  - B Philosophy (General) (1)
  - BF Psychology (216)
  - BJ Ethics (1)
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- C Auxiliary Sciences of History (1)
  - CB History of civilization (1)
- D History General and Old World (7)
  - D History (General) (7)
- G Geography. Anthropology. Recreation (89)
  - G Geography (General) (79)
  - GR Folklore (7)
  - GV Recreation Leisure (3)
- H Social Sciences (1357)
  - H Social Sciences (General) (451)
  - HB Economic Theory (375)
  - HC Economic History and Conditions (4)
  - HD Industries. Land use. Labor (6)
    - HD28 Management. Industrial Management (3)
    - HD61 Risk Management (1)
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- J Political Science (3)
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- L Education (698)
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    - LB2361 Curriculum (2)
  - LC Special aspects of education (1)
- M Music and Books on Music (7)
  - M Music (3)
  - 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 (979)
  - P Philology. Linguistics (575)
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  - PE English (263)
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  - PQ Romance literatures (6)
- Q Science (753)
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  - QA Mathematics (747)
    - QA75 Electronic computers. Computer science (388)
    - QA76 Computer software (92)
  - QP Physiology (4)
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- R Medicine (39)
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  - RM Therapeutics. Pharmacology (24)
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- S Agriculture (91)
  - S Agriculture (General) (86)
  - SB Plant culture (3)
  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (310)
  - T Technology (General) (60)
  - TA Engineering (General). Civil engineering (General) (153)
  - TC Hydraulic engineering. Ocean engineering (2)
  - TD Environmental technology. Sanitary engineering (8)
  - TE Highway engineering. Roads and pavements (8)
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  - TK Electrical engineering. Electronics Nuclear engineering (61)
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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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    - ZA4050 Electronic information resources (1)