[Salmson 2 A2 aircraft in flight near an observation balloon]

Photograph of a Salmson 2 A2 aircraft (fuselage number 4) of the 90th Aero Squadron, U.S. Army Air Service, in flight near an observation balloon, circa 1917-1919.

Inscription on album page: "U.S. Observation baloon [sic] and Salmson plane."

Part of Album One from the Nancy Harkness Collection of World War I Photograph Albums, circa 1914-1919.

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