Hartley, Ruth E.  b.1909 <br/><br/>
Understanding children's play / 
by Ruth E. Hartley, Lawrence K. Frank [and] Robert M. Goldenson 
 - New York :  Columbia University Press,  1952 
 - 372 p. :  ill. ;  22 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Play--Psychological aspects<br/>Child psychology
<br/><br/><label>Dewey Class. No.: </label>136.7479