Bellamy JOHN C <br/><br/>
Digital TELEPHONY C. 3rd th 
Bellamy John c 
 - 3rd 
 - xxv,643p.:  ill,indexes 
<br/><br/><label>ISBN: </label>108126509295 9788126509294 
<br/><br/><label>LC Class. No.: </label>TY 5103.7  / .B 44 2000