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Thompson, Gare.

Lever, screw, and inclined plane : the power of simple machines / by Gare Thompson. - Washington DC : National Geographic, 2006. - 40 p. : col. ill. ; 21 cm. - National Geographic science chapters. .

Includes bibliographical references (p. 39) and index.

0792259491 (library binding) 9780792259497 (library binding)

2006016328


Simple machines.

621.8