Frederick, John H. <br/><br/>
Commercial air transportation 
by John H. Frederick 
 - 5th ed. 
 - Homewood  Irwin  1961 
 - 497p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air Lines - U.S.A.
<br/><br/><label>Dewey Class. No.: </label>W6x73 F873