Penrose, L S <br/><br/>
Biology of mental defect / 
 The biology of mental defect 
by L S Penrose 
 -  Sidgurick & Jack, 
 - 374p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education
<br/><br/><label>Dewey Class. No.: </label>370  / PEN.B