Frederick, John H.  1896- <br/><br/>
Commercial air transportation / 
John H. Frederick. 
 - Fourth edition 
 - 547 pages :  23 cm 
<br/><br/><label>LCCN: </label>55009352  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aeronautics, Commercial--United States.
<br/><br/><label>LC Class. No.: </label>TL521  / .F65 1955 
<br/><br/><label>Dewey Class. No.: </label>380.5