PRODUCT handbook 

 - 5th ed. 
 - [S.l]  Noethern telecon  1983 
 - x, 244 p. 
<br/><br/><label>ISBN: </label>246678 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone
<br/><br/><label>Dewey Class. No.: </label>384.6  / PRO