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Library of Congress Subject Areas (1189)
- L Education (5)
  - L Education (General) (5)
- P Language and Literature (1)
  - PE English (1)
- Q Science (4)
  - QA Mathematics (4)
    - QA75 Electronic computers. Computer science (1)
    - QA76 Computer software (4)
- S Agriculture (1)
  - S Agriculture (General) (1)
- T Technology (1183)
  - T Technology (General) (3)
  - TA Engineering (General). Civil engineering (General) (2)
  - TD Environmental technology. Sanitary engineering (1)
  - TH Building construction (1)
  - TJ Mechanical engineering and machinery (432)
  - TK Electrical engineering. Electronics Nuclear engineering (485)
  - TR Photography (1)
  - TS Manufactures (274)