John Ronayne <br/><br/>
The Integrated Services Digital Network From Concept To Application 

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 -  Pitman  1987 
 - 230 
<br/><br/>  
<br/><br/><label>ISBN: </label>0-273-02677-1 
<br/><br/><label>Dewey Class. No.: </label>004.738.5