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      Knowledge is Power

      Scientific American November 13, 1920

      Inventions New and Interesting

      A Department Devoted to Pioneer Work in the Arts

      • November 13, 1920

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      More in the November 13, 1920 issue of Scientific American
      • Fuel or Fertilizer?
      • Solving the Labor Problem--II
      • "Obstipui, Comae Steterint"
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