Nelson, Pearl Astrid. <br/><br/>
Elementary school science activities 
by Pearl Astrid Nelson. 
 - Englewood Cliffs, N.J.  Prentice-Hall  [1968] 
 - ix, 210 p.  illus. 
<br/><br/>Bibliography: p. 199-202. 
<br/><br/><label>LCCN: </label>68019972  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (Elementary)