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Library of Congress Subject Areas (9373)
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- T Technology (5688)
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  - TC Hydraulic engineering. Ocean engineering (64)
  - TD Environmental technology. Sanitary engineering (470)
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    - TD895-899 Industrial and factory sanitation (15)
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  - TE Highway engineering. Roads and pavements (67)
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  - TH Building construction (352)
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    - TH9025-9092 Protection of buildings (5)
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  - TJ Mechanical engineering and machinery (720)
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  - TK Electrical engineering. Electronics Nuclear engineering (1378)
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    - TK7800-8360 Electronics (439)
    - TK9001-9401 Nuclear engineering. Atomic power (1)
  - TL Motor vehicles. Aeronautics. Astronautics (136)
    - TL1-484 Motor vehicles. Cycles (75)
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  - TN Mining engineering. Metallurgy (35)
  - TP Chemical technology (383)
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  - TR Photography (5)
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