Heber Rick F <br/><br/>
Epidemiology of mental retardation / 
by Rick Heber. 
 - Springfield, Ill. :  Thomas,  1970. 
 - 119 p. :  illus. ;  25 cm. 
<br/><br/>Bibliography: p. 100-112. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental retardation
<br/><br/><label>LC Class. No.: </label>WM300