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[Man working on engine of Douglas O-38B aircraft ]
Photograph of a man working on the engine of a Douglas O-38B aircraft (fuselage number 9), circa 1930s-1940s.

[Engine mechanic's license issued to Robert L. Simons, circa 1930s]
Engine mechanic's license issued to Robert L. Simons by the Aeronautics Branch, U.S. Department of Commerce, circa 1930s.
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