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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.

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.

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.

Photograph of a Douglas T2D-1 seaplane, June 11, 1929. Several people are maneuvering the boat via its pontoons.Caption: "1254 / T2D-1 / 6-11-29 / Plane 396."

Photograph of a Curtiss Tanager aircraft in flight, circa 1929-1930.

Photograph of the Blériot 125 aircraft on display at the Paris Air Show, Paris, France, 1930.

Photograph of a De Havilland D.H.80A Puss Moth aircraft (fuselage designation G-ABBS), circa 1930.

Photograph of the Dewoitine D.33 "Le Trait d'Union" aircraft, circa 1930.Caption: "Avion de Record 'Trait d'Union' / Dewoitine D.33 / Cliché Tito."

Photograph of a German Dornier Do R Superwal flying boat (wing designation I-R ENE), circa 1930.

Photograph of a U.S. Army Air Service Curtiss P-6 Hawk aircraft (fuselage number 22), circa 1930. Inscription on verso: "U.S. Army pursuit biplane / circa 1930."