Langley, Graham <br/><br/>
Telecommunications premier: System and applications 

 - New Delhi  Galgotia Publlications  1996 
 - 283p.  26 cm. 
<br/><br/><label>ISBN: </label>8175150637 
<br/><br/><label>Dewey Class. No.: </label>621.38,  / D, Lan