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Library of Congress Subject Areas (8452)
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  - TC Hydraulic engineering. Ocean engineering (58)
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  - TE Highway engineering. Roads and pavements (57)
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  - TJ Mechanical engineering and machinery (700)
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    - TK7800-8360 Electronics (406)
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  - TL Motor vehicles. Aeronautics. Astronautics (134)
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  - TP Chemical technology (325)
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