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You are here: Home > Just Books > Ages 4-7 > Welcome Books > Simple Machines
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What Is A Plane?
Our Price: $4.95 		What Is A Pulley?
Our Price: $4.95 		What Is A Screw?
Our Price: $4.95 		What Is A Wedge?
Our Price: $4.95
24 Pages.
Ages 4-7 		24 Pages.
Ages 4-7 		24 Pages.
Ages 4-7 		24 Pages.
Ages 4-7
What Is A Wheel & Axle?
Our Price: $4.95
24 Pages.
Ages 4-7