Fred Jennings <br/><br/>
Practical Data Communications, Modems ,Networks & Protocols 

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 -  Blackwell Scientific Publications  1986 
 - 242 
<br/><br/>  
<br/><br/><label>ISBN: </label>0-623-01306-0 
<br/><br/><label>Dewey Class. No.: </label>004.738.5