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Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 7) in flight, circa 1930s.

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

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 6) in flight, circa 1930s. The man in the rear cockpit is standing up.

Photograph of a California National Guard Douglas O-38 airccraft (fuselage number 6) in flight, circa 1930s. The man in the rear cockpit is standing up.

Photograph of a California National Guard Douglas O-38 aircraft in flight, circa 1930s.

Photograph of a California National Guard Douglas O-38 aircraft (N.G. serial number 31-373) in flight, circa 1930s.

Photograph of a California National Guard Douglas O-38 aircraft in flight, circa 1930s. The man in the rear cockpit is standing up and waving at the camera.

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 9) in flight, circa 1930s. Caption: "38-103."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 9) in flight, circa 1930s. Caption: "38-104."