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Are you J.P. Den Hartog, author of the books below?
Mechanics by J.P. Den Hartog Mechanical Vibrations by J.P. Den Hartog Strength of Materials by J.P. Den Hartog Advanced Strength of Materials by J.P. Den Hartog Mechanical Vibrations by J.P. Den Hartog Mechanical Vibrations, fourth edition by J.P. Den Hartog Strength of materials by J.P. Den Hartog Advanced Strength of Matherials by J.P. Den Hartog Strength Of Materials by J.P. Den Hartog


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