Sund, Robert B. <br/><br/>
Investigate and discover  elementary science lessons 
Robert B. Sund, Bill W. Tillery, Leslie W. Trowbridge. 
 - Boston  Allyn and Bacon  [1975] 
 - xxii, 362 p.  ill.  23 cm. 
<br/><br/><label>ISBN: </label> 12.95 
<br/><br/><label>LCCN: </label>74022414  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (Elementary)
<br/><br/><label>LC Class. No.: </label>LB1585  / .S88 
<br/><br/><label>Dewey Class. No.: </label>372.3/5/044