Brown, J  <br/><br/>
Telecommunications 

 - London  ELBS  1964 
 - 382p. 
<br/><br/><label>ISBN: </label>412128500 
<br/><br/><label>Subjects--Index Terms: </label>Telecommunications 
<br/><br/><label>Universal Decimal Class. No.: </label>621.39   / BRO