Jolley, E.H. <br/><br/>
Introduction to telephony and telegraphy 
/ by E.H.Jolley 
 - London  ELBS  1971 
 - x, 413 p. 
<br/><br/> Includes appendixes and index. 
<br/><br/><label>ISBN: </label>273317229 
<br/><br/><label>Dewey Class. No.: </label>621.385  / JOL