Boeing P-12Ds [in flight]

Photograph of several United States Army Air Corps Boeing P-12D (Model 227) aircraft in flight, likely at the National Air Races in Ohio, circa 1930s.

Inscription: "U.S. Army. Boeing P-12Ds."

Item from page 48 of the LeRoy Milliren National Air Races photograph album, circa 1920s-1930s. Album contains one hundred ninety-eight (198) black-and-white photographs taken at the air races during this time period.