Langley, Graham <br/><br/>
Telecommunications Primer / 
Graham Langley 
 - 2nd ed. 
 - London :  Pitman Publishing,  1986 
<br/><br/><label>ISBN: </label>0273024787 9780273024781 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunications Primer
<br/><br/><label>Dewey Class. No.: </label>621.3841  / LAN