Science and Invention (1920-1931 Experimenter Publishing) Vol. 13 #9

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Jan. 1926. Edited by Hugo Gernsback. Articles include "Air Transportation Station of 1950," "New Helicopter-Airplane, "Bridging the English Channel" and much more. 8 1/2-in. x 11 1/2-in., 96 pages, B&W. Cover price $0.25.