Piaget, Jean. <br/><br/>
The child's conception of number / Jean Piaget 

 - New York  W.W. Norton & Company, Inc.  c1965. 
 - 248 p. 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Cognition in children.
<br/><br/><label>Dewey Class. No.: </label>136.745101 P57