Thorn, Samuel A. <br/><br/>
Let's see why / 
Samuel A. Thorn and Carl D. Duncan ; illustrated by Fiore Mastri and Maidi Wiebe. 
 - Chicago :  Benefic press,   c 1961.  
 - 192 p. :  ill. ;  22 cm.   
 - Science and conservation series. .
<br/><br/>329  329 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English fiction.<br/>Science.
<br/><br/><label>Dewey Class. No.: </label>823 / T393l