Frost, Helen,1949-

What are levers? /by Helen Frost ; consulting editor, Gail Saunders-Smith ; consultant, Philip W. Hammer.
Mankato, Minn. :Pebble Books,c2001.

24 p. :col. ill.

Includes bibliographical references and index.

Simple text and photographs present levers and their function as a simple machine.

1.LeversDynamic Details
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