Barton, Byron. <br/><br/>
Machines at work 
Byron Barton 
 - [s.l.]  HarperCollins  1987 
 - (32) p. 
<br/><br/><label>ISBN: </label>9780694001903 (trade bdg.) 9781428762626 (BWI bdg.) 
<br/><br/><label>Dewey Class. No.: </label>AP Toddler [E]