Shields, Bert A.  <br/><br/>
Principles of Air navigation /  
by Bert A. Shields 
 - vii, 450 pages :   illustrated ;   20 cm.  
 - The introductory aviation series .
<br/><br/> Includes index.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Navigation (Aeronautics).
<br/><br/><label>Dewey Class. No.: </label>629.132521  / Sh6p