Blough, Glenn Orlando. <br/><br/>
Elementary school science and how to teach it 
[by] Glenn O. Blough [and] Julius Schwartz. 
 - 4th ed. 
 - New York  Holt, Rinehart and Winston  [1969] 
 - v, 810 p.  illus.  24 cm. 
<br/><br/>Bibliography: p. [767]-794. 
<br/><br/><label>ISBN: </label>0030698901 
<br/><br/><label>LCCN: </label>69017647  
<br/><br/><label>Nat. Bib. No.: </label>GB70-2824 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (Elementary)
<br/><br/><label>LC Class. No.: </label>Q181  / .B558 1969 
<br/><br/><label>Dewey Class. No.: </label>372.3/5