Heldman, Robert K. <br/><br/>
Information telecommunications: networks, products and services  networks, products and services 
Robert K. Heldman. 
 - New York :  McGraw-Hill,  c1994. 
 - xiv, 393 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0070280401 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication--Social aspects.<br/>Information networks--Social aspects.<br/>Information science--Social aspects.
<br/><br/><label>Dewey Class. No.: </label>384