Jolley, Ernest Harris. <br/><br/>
Introduction to telephony and telegraphy / 
E. H. Jolley. 
 - 1st ed 
 - London,  Pitman,  1997 
 - ax, 413 p.  : ills.;  24 cm. 
<br/><br/>Includes bibliography and index. 
<br/><br/><label>ISBN: </label>8185614369 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone.<br/>Telegraph.
<br/><br/><label>Dewey Class. No.: </label>621.38  / JOI