Spencer, Francis A. <br/><br/>
Air mail payment and the government 
by Francis A. Spencer 
 - Washington  The Brookings Institution  1941 
 - xii, 402p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air mail
<br/><br/><label>Dewey Class. No.: </label>W718x73 Sp33