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Simple Machines: Inventions That Changed the World and the Science Behind Them
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Library
from Crabtree Pub Co (September 1, 2015)
9780778718901 | details & prices | 32 pages | 8.00 × 10.00 × 0.25 in. | Rec. grade levels 4-6 | 0.78 lbs | List price $27.60