Oxford Junior encyclopaedia : communications  

 - London :  Oxford University,  1976. 
 - Vol.IV, xv,496p.;  ill.;  26cm 
<br/><br/><label>ISBN: </label>199100241 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopeadia
<br/><br/><label>Dewey Class. No.: </label>030  / OXF