Frederick, John H.  1896- <br/><br/>
Commercial air transportation / 
by John H. Frederick. 
 - 5th ed. 
 - Homewood, Ill.,  R.D. Irwin,  1961. 
 - 497 p. :  ill. ;  24 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aeronautics--Commercial--United States<br/>Airlines.
<br/><br/><label>Dewey Class. No.: </label>387.70973  / FRC 1961