Let's discover the world of machines. 

 - Rev. ed. 
 - Milwaukee :  Raintree Publishers,  1986. 
 - 79 p. :  ill. 
 - Let's discover ;  11 .
<br/><br/><label>ISBN: </label>0817226109 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machinery--Juvenile literature.
<br/><br/><label>Dewey Class. No.: </label>031 s  621.8�19