Telecommunications in practice  

 - Landon  British telecommunications plc  1985 
 - variable pages 
<br/><br/><label>ISBN: </label>0863570186 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication
<br/><br/><label>Dewey Class. No.: </label>621.38  / TEL