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Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Caption: "(O38 92-P-115) (2-6-31) (12-4100)."

Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Caption: "(O37 92-P-115) (2-6-31) (12-4100)."

Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Caption: "(O39-92P-115) (2-6-31) (12-4100)."

Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Inscription: "(O42A-92P-115) (2-6-31) (12-4100)."

Photograph of three U.S. Army Air Corps Douglas O-38 aircraft in flight, July 22, 1932. Caption: "(0199-61G-115) (7-22-32)."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 7) in flight, November 8, 1936. Caption: "(O-92P-115) (11-8-36) (10-5000) O-38 in flight."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 7) in flight, November 8, 1936. Caption: "(O1-92P-115) (11-8-36) (10-5000) O-38 in flight."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 4) in flight, November 8, 1936. The pilot in the front cockpit is sticking his tongue out at the camera. Caption: "(O-92P-115) (11-8-36) (10-5000) O-38 in flight."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 4) in flight, circa 1930s. Caption: "38-146."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 4) in flight, circa 1930s. Caption: "38-146."