Powell, Len S. <br/><br/>
Communication and learning 
Len S.Powell 
 - London  Pitman  1969 
 - xii, 217p. 
<br/><br/><br/>eng 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Learning
<br/><br/><label>Dewey Class. No.: </label>370.152  / POC