Science and Invention (1920-1931 Experimenter Publishing) Vol. 9 #4

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Aug. 1921. Edited by Hugo Gernsback. Articles include "How Insects Hear and Smell," "Photographing the Aurora," "Airplane or Battleship - Which?" and much more. 8 1/2-in. x 11 1/2-in., 96 pages, B&W. Cover price $0.25.