Library of Congress Subject Areas (18)
- T Technology (8)
  - T Technology (General) (105)
  - TA Engineering (General). Civil engineering (General) (34)
  - 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 (37)
  - 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 Wed Sep 17 10:55:52 2025 UTC.

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