K. Lovell <br/><br/>
The Growth of basic mathematical and scientific concepts in children 

 - London  University of london  1971 
 - 158p  22cm 
<br/><br/><label>ISBN: </label>0340083816 
<br/><br/><label>Subjects--Uniform Titles: </label><br/> Number concept in children.<br/> Conservation (Psychology)
<br/><br/><label>Dewey Class. No.: </label>372.7 L899g