Powell, Len.S. <br/><br/>
Communication an dlearining 

 - London  Sir Isaac Pitman and Sons Ltd.  1969 
 - xii,217p.  25cm. 
<br/><br/> Dormitory:146266 
<br/><br/><label>ISBN: </label>273406973 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Communication System
<br/><br/><label>Dewey Class. No.: </label>621.38411  / P71C