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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 Douglas YO-31A aircraft (tail number 8) parked near a California National Guard hangar, circa 1930s.

Photograph of a Douglas YO-31A aircraft (tail number 8) parked near a California National Guard hangar, circa 1930s.