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[Douglas C-1 aircraft aerially refueling Fokker C-2A "Question Mark"]
Photograph of a Douglas C-1 aircraft (fuselage number 1) aerially refueling the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.

[Aerial refueling procedure between Douglas C-1 aircraft and Fokker C-2A "Question Mark]
Photograph of an aerial refueling procedure between a Douglas C-1 aircraft and the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.

[Douglas C-1 aircraft aerially refueling Fokker C-2A "Question Mark"]
Photograph of a Douglas C-1 aircraft (fuselage number 1) aerially refueling the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.
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