Bates, Regis J. <br/><br/>
Principles of Voice & Data Communications / 
Regis J. Bates 
 - Boston:  Mc-Graw Hill, Publisher  ©2007 
 - xxviii, 782p:  ill. ;   22 cm 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>9780071257671 (pbk) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Evolution of Telephone Set
<br/><br/><label>Dewey Class. No.: </label>621.38  / BAT