Royston, Angela,  <br/><br/>
Pulleys and gears 

 - 32 pages :   colour illustrations ;   27 cm 
 - How it works .
 - How it works .
<br/><br/><label>ISBN: </label>0431017433 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pulleys - Juvenile literature ; Gearing - Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>621.83