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

 - London  Kegan Paul, Trench, Trubner & Company Limited  1928 
 - viii,760  Hb 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>155.4