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      Scientific American June 16, 1917

      Detecting the Pretense of Deafness

      Tests Adopted in France to Reveal the Tricks of Slackers

      • June 16, 1917

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      More in the June 16, 1917 issue of Scientific American
      • A Modern Commercial Volcano
      • Protecting Merchant Vessels against Submarines
      • The Religious Ideas of the Northwest Coast Indians
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