Beauchamp, Wilbur L.  1891-1962. <br/><br/>
How do we know? / 
by Wilbur L. Beauchamp, Gertrude Crampton, and William S. Gray. 
 - Chicago :  Scott, Foresman and Co.,  1945. 
 - 96 p. :  ill. (part col.) ;  26 1/2 x 21 cm. & guidebook. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Juvenile literature.