Humphrey, James H.  1911-2008 <br/><br/>
Mathematics can be child's play / 
by James H. Humphrey, Joy N. Humphrey. 
 - Springfield, Ill.:   Thomas,   1990.  
 - vii, 169 p. ;  26 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0398056692 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)<br/>Experiential learning
<br/><br/><label>Dewey Class. No.: </label>372.7