Held, Gilbert,  1943- <br/><br/>
Understanding data communications :  from fundamentals to networking / 
Gilbert Held. 
 - 3rd ed. 
 - Chichester ;  New York :  Wiley,  1991. 
 - ix 368 p. :  ill., map ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0471627453 (alk. paper) 
<br/><br/><label>LCCN: </label>00032094  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems.<br/>Computer networks.
<br/><br/><label>LC Class. No.: </label>TK5105  / .H429 2000 
<br/><br/><label>Dewey Class. No.: </label>004.6