Davis K <br/><br/>
Ionosphric radio waves 

 -  1969 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>71683 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical engineering
<br/><br/><label>Dewey Class. No.: </label>D666:2, K9;1-;2