The Fort on Fourth Street


Book Description

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.




Fort on Fourth Street, The: A Story about the Six Simple Machines


Book Description

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.







Reports of the Department of Labor


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The City Record


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Annual Report ..


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U.S. Employment Service Bulletin


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The City Record


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