How to catapult a castle
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"Presents the science behind building and defending castles including the use of simple machines, such as pulleys and levers"--Provided by publisher.
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"Presents the science behind building and defending castles including the use of simple machines, such as pulleys and levers"--Provided by publisher.
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""Presents the science behind building and defending castles including the use of simple machines, such as pulleys and levers"--Provided by publisher."
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