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      Knowledge is Power

      Scientific American June 19, 1920

      The Motor-Driven Commercial Vehicle - June 19, 1920

      • By Victor W. Pag on June 19, 1920

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      More in the June 19, 1920 issue of Scientific American
      • Common Sense in the Laboratory
      • How Much Paper in Your Shoes?
      • What is Wrong with Our Paper Supply?
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