Radio Handbook/ 
By William I. Orr. 
 - 20th 
 - USA:  Howard W. Sams & Co., Inc.,  1975. 
 - xi,1080p.:  ill.;  24cm. 
<br/><br/><label>ISBN: </label>0672240327 
<br/><br/><label>Dewey Class. No.: </label>384.5 ORR