Roddy, Dennis,  4  0  1931- <br/><br/>
Electronic communications /        6 
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Dennis Roddy, John Coolen. 
 - 3rd ed.   
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 - xii, 788 p. :  ill.   25 cm.     
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<br/><br/><label>ISBN: </label>835915980  Php988.50 
<br/><br/><label>ISSN: </label>2 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.    --------20--
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<br/><br/><label>LC Class. No.: </label>TK 5101 R58 1984  / 2 
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