Frederick, John H. <br/><br/>
Commercial air transportation / 
John H. Frederick 
 - 3rd. ed. 
 - Chicago :  Irwin ,  1951 
 - xiii, 473p. :  ill. ;  25 cm. 
<br/><br/>Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Transport and communications<br/>Air transport<br/>Aeronautics, Commercial--United States
<br/><br/><label>Dewey Class. No.: </label>385  / FRE 2