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      Scientific American September 12, 1914

      Man's Chin

      A Dynamical Basis for Physical and Psycho-Physiological Utilities

      • September 12, 1914

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      More in the September 12, 1914 issue of Scientific American
      • A New Way of Selling
      • Electric Mine Gas Detectors
      • Refractive Index of Radium Emanations
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