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Age 7-9
Grade 2-4

Dana Meachen Rau

Simple Machines

Library Binding (Turtleback Books Sept. 1, 2011) , Bound for Schools & Libraries ed. edition
FOR USE IN SCHOOLS AND LIBRARIES ONLY. How did workers in ancient civilizations move the huge stones they used to build cities? They rolled the stones over logs much like a modern-day conveyor belt..
Series
True Books: Physical Science (Paperback)
ISBN
0606373616 / 9780606373616
Pages
48
Weight
9.6 oz.
Dimensions
7.1 x 0.4 in.

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