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Library of Congress Subject Areas (8372)
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  - TC Hydraulic engineering. Ocean engineering (58)
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  - TE Highway engineering. Roads and pavements (56)
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  - TJ Mechanical engineering and machinery (698)
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    - TK7800-8360 Electronics (404)
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  - TL Motor vehicles. Aeronautics. Astronautics (134)
    - TL1-484 Motor vehicles. Cycles (73)
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  - TN Mining engineering. Metallurgy (35)
  - TP Chemical technology (321)
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