U.S.Dept of Commerce, Washington <br/><br/>
Ionospheric radio propagation   
ed by Kennethy Davies 
 - Washington  U.S.Dept of Commerce  1965 
 - xiv, 470p 
 - National Bureau of Standards Monoraph  80 .
<br/><br/><label>Dewey Class. No.: </label>621.38411  / N65