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Library of Congress Subject Areas (748)
- B Philosophy. Psychology. Religion (4)
  - BF Psychology (2)
  - BL Religion (2)
- D History General and Old World (1)
  - DS Asia (1)
- G Geography. Anthropology. Recreation (7)
  - G Geography (General) (4)
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- H Social Sciences (114)
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  - HB Economic Theory (26)
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  - HD Industries. Land use. Labor (22)
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    - HD61 Risk Management (5)
  - HE Transportation and Communications (3)
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- L Education (135)
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- N Fine Arts (23)
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- P Language and Literature (56)
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- Q Science (260)
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    - QA76 Computer software (57)
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- R Medicine (101)
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    - RA0421 Public health. Hygiene. Preventive Medicine (1)
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  - RS Pharmacy and materia medica (39)
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- S Agriculture (12)
  - S Agriculture (General) (10)
  - SB Plant culture (3)
- T Technology (160)
  - T Technology (General) (22)
  - TA Engineering (General). Civil engineering (General) (80)
  - TE Highway engineering. Roads and pavements (10)
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  - TJ Mechanical engineering and machinery (41)
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