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Library of Congress Subject Areas (10424)
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- T Technology (6389)
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  - TC Hydraulic engineering. Ocean engineering (65)
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  - TE Highway engineering. Roads and pavements (74)
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  - TJ Mechanical engineering and machinery (746)
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  - TK Electrical engineering. Electronics Nuclear engineering (1463)
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    - TK7800-8360 Electronics (463)
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  - TL Motor vehicles. Aeronautics. Astronautics (140)
    - TL1-484 Motor vehicles. Cycles (77)
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    - TL787-4050 Astronautics. Space travel (1)
  - TN Mining engineering. Metallurgy (39)
  - TP Chemical technology (416)
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  - TR Photography (5)
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- U Military Science (2)
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- V Naval Science (4)
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