Walker, Sally M <br/><br/>
Pulleys 
by Sally M. Walker 
 - London  Lerner  2008 
 - 48 p. : col. ill 
<br/><br/><label>ISBN: </label>9781580134361 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machine engineering
<br/><br/><label>Dewey Class. No.: </label>621.811 WAL