FFA statistical hand =book of aviation 

 - Washington,DC. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aeronautics<br/>United States<br/>STATSTICS<br/>AIR NAVIGATION
<br/><br/><label>GPO Item No.: </label>0431-C-14(online) 
<br/><br/><label>Gov. Doc. Class. No.: </label>FFA 1.32: