Hardwick, Steve <br/><br/>
Isdn design  : a practical approach/ 
by Steve Hardwick 
 - San Diego  Academic Press  1989 
 - x, 152 p. 
<br/><br/><label>ISBN: </label>123249708 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital communications
<br/><br/><label>Dewey Class. No.: </label>004.6  / HAR