The Fort on Fourth Street
Author: Lois Spangler
Publisher: Arbordale Publishing
Published: 2013-01-01
Total Pages: 18
ISBN-13: 1607186209
DOWNLOAD EBOOKBuilding 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.