Piaget Jean <br/><br/>
Child's conception of number 

 - London  Routledge and Kegan Paul         1941 
 - ix, 247p  cm. 
 - International Library of Psychology, Philosophy and Scientific Method .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics
<br/><br/><label>Dewey Class. No.: </label>B13, H1