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      Knowledge is Power

      Scientific American October 26, 1918

      The Invasion of the Trenches by Rats—I

      Its Causes and Its Remedies

      • October 26, 1918

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      More in the October 26, 1918 issue of Scientific American
      • Chloropicrin
      • Metals used in Aeroplane Construction
      • Standardization of Freight Cars and Locomotives
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