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You searched for objects where the object has images and the subcategory is Airmail Flight Cover and the airline is United Air Lines or United Aircraft Corporation or United Airlines or United Express or United Shuttle and the aircraft is Douglas DC-7 and decade is 1950 and the query mode is to match the entire phrase
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airmail flight cover: United Air Lines, Douglas DC-7, San Francisco - New York route
06/01/1954
2014.156.214 a b
 
airmail flight cover: 4-cent airmail postage stamp, United Air Lines
09/03/1954
2015.168.785