Blue Book (March, 1916) "The Air-Tapper" A Jabez Bunker story. Later reprinted as "Tapping the Air" in World Magazine, December 3, 1916. p 1003-1012. [HARPER]
World Magazine (December 3, 1916) "Tapping the Air" Reprint of "The Air-Tapper." p 7+. [HARPER]