The new seeing why / 
Thomas I. Dowling...[et al.]. 
 - Teachers ed. 
 - Philadelphia :  John C. Winston com.,   c 1957. 
 - vi, 196 p. :  ill. ;  24 cm. 
 - Understanding science. .
<br/><br/>332  332 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Education.
<br/><br/><label>Dewey Class. No.: </label>507 / D756n