Esler, William K- <br/><br/>
Teaching elementary science / 
William K. Esler, Mary K. Elser. 
 - Belmont, Ca.  Wadsworth Publishing Co.  1973 
 - 566 p. :   ill. ;   26 cm. 
<br/><br/> includes index 
<br/><br/><label>ISBN: </label>0534002838 
<br/><br/><label>LCCN: </label>72-96821 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (Elementary)