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      Knowledge is Power

      Scientific American September 13, 1919

      Sweet Potatoes the Year Round, Varnished Raisins

      • September 13, 1919

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      More in the September 13, 1919 issue of Scientific American
      • Inventions New and Interesting - September 13, 1919
      • Recently Patented Inventions - September 13, 1919
      • The Science of Tennis
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