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Library of Congress Subject Areas (459)
- A General Works (2)
  - AS Academies and learned societies (General) (2)
- B Philosophy. Psychology. Religion (15)
  - BF Psychology (3)
  - BL Religion (2)
  - BP Islam. Bahaism. Theosophy, etc (10)
- D History General and Old World (4)
  - D History (General) (2)
  - DS Asia (2)
- G Geography. Anthropology. Recreation (23)
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  - GF Human ecology. Anthropogeography (1)
  - GV Recreation Leisure (21)
- H Social Sciences (119)
  - H Social Sciences (General) (39)
  - HA Statistics (6)
  - HC Economic History and Conditions (3)
  - HD Industries. Land use. Labor (73)
    - HD28 Management. Industrial Management (47)
    - HD61 Risk Management (26)
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  - HN Social history and conditions. Social problems. Social reform (35)
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  - HT Communities. Classes. Races (7)
  - HV Social pathology. Social and public welfare (15)
- J Political Science (12)
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- K Law (3)
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- L Education (28)
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    - LB2300 Higher Education (11)
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    - LC5201 Education extension. Adult education. Continuing education (1)
- P Language and Literature (21)
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  - PN Literature (General) (6)
    - PN0080 Criticism (2)
    - PN0441 Literary History (2)
  - PR English literature (3)
- Q Science (134)
  - Q Science (General) (44)
  - QA Mathematics (63)
    - QA75 Electronic computers. Computer science (51)
    - QA76 Computer software (7)
  - QC Physics (33)
  - QD Chemistry (29)
  - QE Geology (1)
  - QH Natural history (14)
    - QH301 Biology (14)
  - QM Human anatomy (1)
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- R Medicine (22)
  - R Medicine (General) (15)
  - RA Public aspects of medicine (12)
    - RA0421 Public health. Hygiene. Preventive Medicine (7)
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    - RC1200 Sports Medicine (1)
  - RG Gynecology and obstetrics (1)
  - RM Therapeutics. Pharmacology (1)
- S Agriculture (1)
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- T Technology (226)
  - T Technology (General) (100)
  - TA Engineering (General). Civil engineering (General) (75)
  - TC Hydraulic engineering. Ocean engineering (1)
  - TD Environmental technology. Sanitary engineering (15)
  - TE Highway engineering. Roads and pavements (2)
  - TF Railroad engineering and operation (1)
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  - TJ Mechanical engineering and machinery (66)
  - TK Electrical engineering. Electronics Nuclear engineering (52)
  - TL Motor vehicles. Aeronautics. Astronautics (20)
  - TP Chemical technology (13)
  - TS Manufactures (6)
- U Military Science (44)
  - U Military Science (General) (44)
- V Naval Science (3)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)