Langley, Graham <br/><br/>
Telecommunications primer / 
Graham Langley 
 - 2nd ed. 
 - London  Pitman  1986 
 - vi, 170p.  ill.  24cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>0273024787  RM36.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication