McGavack John <br/><br/>
Guppies, bubbles and vibrating objects : A creative approach to the teaching of science to very young children 

 - New York, USA  The John Day Company  1969 
 - 155p 
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching Technique