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      Knowledge is Power

      Scientific American July 14, 1917

      Inventions New and Interesting- July 14, 1917

      A Department Devoted to Pioneer Work in the Arts

      • July 14, 1917

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      More in the July 14, 1917 issue of Scientific American
      • A Plague of Mice
      • Correspondence- July 14, 1917
      • Science- July 14, 1917
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