Betts, J. A. <br/><br/>
High frequency communications  [Book] / 
[by] J. A. Betts. 
 - New York :  American Elsevier Pub. Co.,  [c1967]. 
 - 98 p. :  illus. ;  23 cm. 
 - Introductory science texts. .
<br/><br/> Index includes 
<br/><br/> All. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Shortwave radio.
<br/><br/><label>Dewey Class. No.: </label>621.384151