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      Scientific American June 12, 1920

      A Boat that Pumps its Way Along, Fighting a Fisherman's Pest and more

      • June 12, 1920

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      More in the June 12, 1920 issue of Scientific American
      • Checking Up Einstein
      • New Books, Etc. - June 12, 1920
      • Correspondence - June 12, 1920
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