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Stimulate your children's inventiveness with an up-close look at these amazing structures. Your 7- to 14-year-olds will learn about the history of bridges and basic span designs---arch, beam, and suspension. They'll also explore the many careers involved in bridge building, from engineers to contractors. And do-it-yourself projects get kids designing, building, and testing their own bridges! 96 pages, softcover from Williamson.
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