"Presents the science behind building and defending castles including the use of simple machines, such as pulleys and levers"--Provided by publisher. Title: How to Catapult a Castle Author: De Winter, James Publisher: Capstone Pr Inc Publication Date: 2009/01/01 Number of Pages: 32 Binding Type: PAPERBACK Library of Congress: 2008023568 Additional Details such as pulleys and levers\"--Provided by publisher. Title: How to Catapult a Castle Author: De Winter" BRAND : De Winter, James
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