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Library of Congress Subject Areas (28)
- Q Science (23)
  - Q Science (General) (10)
  - QA Mathematics (23)
    - QA75 Electronic computers. Computer science (20)
    - QA76 Computer software (19)
- T Technology (9)
  - T Technology (General) (4)
  - TA Engineering (General). Civil engineering (General) (2)
  - TD Environmental technology. Sanitary engineering (1)
  - TH Building construction (2)
  - TK Electrical engineering. Electronics Nuclear engineering (1)
  - TS Manufactures (1)