Greenwood, W. <br/><br/>
A text-book of wireless telegraphy and telephony/ 
W. Greenwood 
 - London:  University Control Press,  1925 
 - vi, 265;  16 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telegraph, wireless<br/>Telegraphone<br/>Telegraph<br/>Telecommunications
<br/><br/><label>Dewey Class. No.: </label>621.3842