s1Clark, J. E.: "Donald E. Keyhoe, 1929", Magonia Exchange, 17 décembre 2007

Col. Lindbergh's Flying Aide Writes Air Mystery Serial "The Sky Raider."

Daily Globe de Ironwood (Michigan), Monday, August 5, 1929

Donald E. Keyhoe, the flying ace, writes from his own remarkable experiences the first thrilling mystery serial of crime in the air, "The Sky Raider," for The Daily Globe.

Colonel [Charles Augustus] Lindbergh recognized Keyhoe's unusual skill and fearlessness by selecting him as his flying aide on his great ‘Round America Tour. Keyhoe is not only a pioneer in the world's newest adventure the conquest of the air, but he is the first to write a mystery story of the skies.

Colonel Lindbergh's flying aide has written a gripping story of romance, adventure, mystery, devotion and death in "The Sky Raider." Don't miss the first of the many thrills coming to you soon in The Daily Globe.