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      Knowledge is Power

      Scientific American June 12, 1920

      Barbados an Oil Field, Soapstone, and more

      • By C. T. Mason on 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
      • A Boat that Pumps its Way Along, Fighting a Fisherman's Pest and more
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