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[Ford Tri-Motor aircraft and Boeing Model 80 aircraft parked in snowy field]

Photograph of a Ford Tri-Motor aircraft (tail number NC-9636) and a Boeing Model 80 aircraft, both with United Air Lines markings, parked in a snowy field, circa March 1933.Inscription on verso: "Mar. 33."Part of a photograph album related to Julius…

[Boeing Model 80 aircraft parked next to United Air Lines building]

Photograph of a Boeing Model 80 aircraft parked next to a United Air Lines building, circa February 1933. Inscription on verso: "Feb. 33. C-30."Part of a photograph album related to Julius A. Barr's personal life and flying career in the United…

[Boeing Model 80 aircraft at airfield]

Photograph of a Boeing Model 80 aircraft at an airfield, March 1933.Inscription on verso: "Mar. 33. [illegible]."Part of a photograph album related to Julius A. Barr's personal life and flying career in the United States and China, circa 1932-1933.

[Passengers boarding United Air Lines Boeing Model 80 aircraft]

Photograph of passengers boarding a United Air Lines Boeing Model 80 aircraft (tail number NC230M), circa 1929-1931. Part of a photograph album related to Julius A. Barr's personal life and flying career in the United States and China, circa…

[Boeing Model 80 aircraft at unidentified airfield]

Photograph of a Boeing Model 80 aircraft at an unidentified airfield, circa 1929-1931. A large crowd is gathered near the aircraft.Part of a photograph album related to Julius A. Barr's personal life and flying career in the United States and China,…

[Boeing Model 80 aircraft]