CCITT <br/><br/>
BLUE BOOK,VOLUME VII,FASCICLE VII.2: TELEGRAPH SWITCHING SERIES U RECOMMENDATIONS, IXTH PLENARY ASSEM 

 - GENEVA  ITU  1989 
 -  2887 
<br/><br/> SC-021 
<br/><br/><label>ISBN: </label>ERNET 
<br/><br/><label>Dewey Class. No.: </label>335