Library of Congress Subject Areas (9)
- T Technology (9)
  - T Technology (General) (115)
  - TA Engineering (General). Civil engineering (General) (36)
  - TD Environmental technology. Sanitary engineering (17)
  - TE Highway engineering. Roads and pavements (1)
  - TF Railroad engineering and operation (1)
  - TJ Mechanical engineering and machinery (8)
  - TK Electrical engineering. Electronics Nuclear engineering (39)
  - TL Motor vehicles. Aeronautics. Astronautics (7)
  - TP Chemical technology (9)
  - TR Photography (6)
  - TS Manufactures (10)
  - TT Handicrafts Arts and crafts (8)

Number of items at this level: 0.

This list was generated on Sat Dec 27 17:56:12 2025 UTC.

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