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  1. Backyard Ballistics by William Gurstelle

    The Book that tells you how to build potato cannons, paper match rockets, Cincinnati fire kites, tennis ball mortars, and more dynamite devices.
    science fair1
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    physics experiments1
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    backyard ballistics1
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    William Gurstelle0

    www.backyard-ballistics.com - 2009-02-12

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