Blough, Glenn Orlando <br/><br/>
Elementary school science and how to teach it / 
Glenn O. Blough, Julius Schwartz. 
 - 5th ed. 
 - New York:   Holt, Rinehart and Winston,   1974.  
 - 753 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliography p. 713-741 and index. 
<br/><br/><label>ISBN: </label>0030915392 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (Elementary)
<br/><br/><label>Dewey Class. No.: </label>372.35044