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Backyard Ballistics - Books for Ages 9 to 12 - Fat Brain Toys. Build Potato Cannons, Paper Match Rockets, Cincinnati Fire Kites, Tennis Ball Mortars, and More Dynamite Devices. How to create bang-up devices that shoot, sizzle, soar, or explode. A must for would-be engineers! Clearly written and illustrated. ... - Backyard Ballistics - Books for Ages 9 to 12 - Fat Brain Toys. | | $16.95
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