Langley, Graham <br/><br/>
Telecommunications primer 

 - 3rd ed. 
 - London:   Pitman Publishing,   1988 
 - vi, 182p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Subjects--Index Terms: </label>Physics 
<br/><br/><label>Universal Decimal Class. No.: </label>621.39  / N0