Armentrout, David and Patricia  <br/><br/>
Wedges 

 - Florida:  Rourke Publishing;  2010. 
 - 24 Pages  Colour Illustrations  26 cm 
 - Simple Machines .
<br/><br/><label>ISBN: </label>9781606943915 
<br/><br/><label>Dewey Class. No.: </label>J 621.8 ARME