Douglas, Lloyd G. <br/><br/>
What is a pulley? / 
Lloyd G. Douglas. 
 - New York :  Children`s Press,  2002. 
 - 24 p. : col. ill.:  15 cm. 
 - Simple machines .
<br/><br/> Lex: BR 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>0-516-34024-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pulleys--Juvenile literature<br/>Pulleys
<br/><br/><label>LC Class. No.: </label>621.811 D74w c2002