Held, Gilbert,  1943- <br/><br/>
Data communications networking devices / 
Gilbert Held 
 - 3rd ed. 
 - New York :  John Wiley & Sons,  1992 
 - xviii, 653 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0471930725  RM156.34 
<br/><br/><label>LCCN: </label>92-004848 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks<br/>Data transmission systems