Smith R A <br/><br/>
Radio aids to navigation 

 -  1948 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>71674 
<br/><br/><label>Source: </label> Annuals, Advances 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical engineering
<br/><br/><label>Dewey Class. No.: </label>D660MD525, H8