Powell, James,   1943 <br/><br/>
Aircraft radio systems /  [Book]. 
J. Powell. 
 - London :   Pitman Publishing Ltd.,   1981, c1985 
 - viii, 255p. :   ill. ;   25cm 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0273084445 0273087614 
<br/><br/><label>LCCN: </label>80020454 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Airplanes--Radio equipment.