Coates, R. F. W. <br/><br/>
Modern communication systems/ 
R. F. W. Coastes 
 - 2nd ed. 
 - London :  English Language Book society,  1983 
 - xii, 398p:  ill;  23 cm 
<br/><br/>Includes references & index. 
<br/><br/><label>ISBN: </label>333358333 (Pbk) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Modern Communication systems
<br/><br/><label>Dewey Class. No.: </label>621.38  / COA