Lovell, Kenneth <br/><br/>
The growth of basic mathematical and scientific concepts in children / 
by K. Lovell ; foreword by Barbel Inhelder 
 - 5th ed. 2nd impression 
 - London :  University of London,  1966 
 - 158 p.  :  illus.  ;  22 cm. 
<br/><br/><label>ISBN: </label>0340087994 
<br/><br/><label>LCCN: </label>72-369405 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number concept in children<br/>Conservation (Psychology)