Frederick, John H. <br/><br/>
Commercial air transportation / 
John H. Frederick. 
 - Revised ed. 
 - Chicago :  Richard D. Irwin,  c 1947. 
 - xviii, 791 p. :  ill. ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/>318  318 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air transportation.
<br/><br/><label>Dewey Class. No.: </label>387.7 / F872c