The fort on Fourth Street : a story about the six simple machines
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The fort on Fourth Street : a story about the six simple machines
-- Fort on 4th Street
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20 Total copies, 18 Copies are in, 2 Copies are out.
Building a fort in the backyard, a grandfather and granddaughter get help from six simple machines: lever, pulley, inclined plane, wheel and axle, screw, and wedge.
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