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Photograph of two U.S. Army Air Corps Douglas O-38 aircraft in low flight over a field, circa 1930s-1940s.

Photograph of two U.S. Army Air Corps Douglas O-38 aircraft in low flight over a field, circa 1930s-1940s.

Photograph of a U.S. Army Air Corps Douglas O-38 aircraft, circa 1930s-1940s. Other aircraft are parked in the background.

Photograph of three U.S. Army Air Corps Douglas O-38 aircraft in flight, July 22, 1932. Caption: "(0199-61G-115) (7-22-32)."

Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Caption: "(O37 92-P-115) (2-6-31) (12-4100)."

Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Caption: "(O38 92-P-115) (2-6-31) (12-4100)."

Photograph of a U.S. Army Air Corps Douglas YO-31A aircraft, February 5, 1933.Caption: "Douglas YO31A / (G-1-92P-115) / 2-5-33."

Photograph of a U.S. Army Air Corps Curtiss P-6 Hawk aircraft, circa 1920s-1930s.

Photograph of a U.S. Army Air Corps Curtiss B-2 Condor aircraft in flight, circa 1920s.Caption: "[Cur]tiss Condor Bomber."

Photograph of a Bristol Fighter F.2B aircraft (tail number P 37) of McCook Field, U.S. Army Air Corps, circa 1910s-1930s. The aircraft has a Royal Flying Corps roundel on the fuselage.