Budavox Handbook of telecommunication 

 - 4a ed. 
 - Budapest :   Budavox Telecommunication foreign trading company Ltd.,   1978. 
 - 1267 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>TELECOMUNICACIONES<br/>TELEGRAFIA<br/>TELEFONIA<br/>REDES DE COMUNICACION
<br/><br/><label>Universal Decimal Class. No.: </label>621.39