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Douglas O-31B (Item)

Photograph of a United States Militia Bureau Douglas O-31 aircraft parked at an airfield, likely at the National Air Races in Ohio, circa 1930s.Inscription: "U.S. Militia Bureau. Douglas O-31B."Inscription on verso: "Douglas O-31B Conqueror 650 M20LM."Inscription underneath photograph on album page: "O-31B F."Item from page 23 of the LeRoy Milliren National Air Races photograph album, circa…