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![Cover for William Gurstelle · Backyard Ballistics: Build Potato Cannons, Paper Match Rockets, Cincinnati Fire Kites, Tennis Ball Mortars, and More Dynamite Devices (Paperback Book) [Second Edition, Second edition] (2012)](https://imusic.b-cdn.net/images/item/original/644/9781613740644.jpg?william-gurstelle-2012-backyard-ballistics-build-potato-cannons-paper-match-rockets-cincinnati-fire-kites-tennis-ball-mortars-and-more-dynamite-devices-paperback-book&class=scaled&v=1411993823)
![Cover for William Gurstelle · Adventures From The Technology Underground: Catapults, Pulsejets, Rail Guns, Flamethrowers, Tesla Coils, Air Cannons and the Garage Warriors Who Love Them (Paperback Book) [Reprint edition] (2007)](https://imusic.b-cdn.net/images/item/original/258/9780307351258.jpg?william-gurstelle-2007-adventures-from-the-technology-underground-catapults-pulsejets-rail-guns-flamethrowers-tesla-coils-air-cannons-and-the-garage-warriors-who-love-them-paperback-book&class=scaled&v=1410183485)