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      Knowledge is Power

      Scientific American April 20, 1918

      The Service of the Chemist- April 20, 1918

      A Department Devoted to Progress in the Field of Applied Chemistry

      • By H. E. Howe on April 20, 1918

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      More in the April 20, 1918 issue of Scientific American
      • The Motor-Driven Commercial Vehicle--April 20, 1918
      • Sewer Pipe Laid on Lake Bottom, Geology in the War, and more
      • Testing Eggs by Photography
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