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Pressing Down : The Lever

By Gerry Bailey, Mike Spoor (Illustrator)
Paperback
$9.95
By Gerry Bailey, Mike Spoor (Illustrator)
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Pressing Down explores the benefits and uses of the lever. RobbO and RobbEE learn how a lever can be formed in three different ways to do different kinds of work—lift and lower, separate, and open.