Piaget, Jean <br/><br/>
The Child's conception of number 
<label>/ by </label> Piaget, Jean 
 - London  Routledge and Kegan Paul  1952 
 - ix, 248p.  22 cm. 
<br/><br/><label>ISBN: </label>710061943 
<br/><br/><label>Dewey Class. No.: </label>136.7  / PIA