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      Knowledge is Power

      Scientific American June 07, 1919

      Inventions New and Interesting - June 7, 1919

      A Department Devoted to Pioneer Work in the Arts

      • June 7, 1919

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      More in the June 07, 1919 issue of Scientific American
      • American Mystery Ships
      • Much Wheat--Little Corn?
      • Bean Harvesting Attachment for Farm Tractors
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