Frost, Helen,  1949- <br/><br/>
What are screws? / 
by Helen Frost. 
 - Mankato, Minn. :  Pebble Books,  c2001. 
 - 24 p. :  col. ill. ;  19 cm. 
 - Looking at simple machines .
<br/><br/>Includes bibliographical references (p. 23) and index. 
<br/><br/><label>ISBN: </label>0736808485 
<br/><br/><label>LCCN: </label>00009868 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Screws--Juvenile literature.
<br/><br/><label>Dewey Class. No.: </label>621.8/82