Keen, R. <br/><br/>
Wireless Direction Finding 
R. Keen                                                      
 - 3rd ed. 
 - London  lliffe and Sons  1938 
 - xi, 803p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NASA Thesaurus<br/>Telecommunication-Wireless<br/>Wireless-Telecommunication
<br/><br/><label>Universal Decimal Class. No.: </label>621.396.93  / KEE