Changes to the air traffic services requirements for air-ground and point-to-point communications 

 - [Montreal]CA  ICAO  1999 
 - 1 v. (various pagings) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>AIR TRANSPORT
<br/><br/><label>Universal Decimal Class. No.: </label>10.05.01 C2771ch