Royston, Angela,  <br/><br/>
Ramp and wedges 

 - 32 pages :   colour illustrations ;   27 cm 
 - How it works .
 - How it works .
<br/><br/><label>ISBN: </label>0431017476 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inclined plane - Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>621.811