Simon, David,  <br/><br/>
Pulleys and gears 

 - 32 pages :   colour illustrations ;   26 cm 
 - How machines work .
 - How machines work .
<br/><br/><label>ISBN: </label>9833671101 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering
<br/><br/><label>Dewey Class. No.: </label>428.6