Berg Joseph M Ed. <br/><br/>
Perspectives and progress in mental retardation    Proceedings of the sixth congress of the international Association for the Scientific study of Mental Deficiency. 
Berg Joseph M Ed. 
 -  1984 
<br/><br/><label>Standard No.: </label>81341 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>S62p1,N82, M4.1-.2