Halsall Fred Au. <br/><br/>
Data communications , communications ,computer networks and opeu systems 

 - 4 
 -  1996 
<br/><br/><label>Standard No.: </label>8041 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D6,8(B),277, N6