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      Knowledge is Power

      Scientific American July 17, 1920

      The Man Behind Our Daily Bread

      Grading and Testing Grain for Sale on the Grain Exchanges of the Country

      • By Robert H. Moulton on July 17, 1920

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      More in the July 17, 1920 issue of Scientific American
      • A Chemical Loafer, and How it was Put to Work
      • Pedigreed Chicks, A New Form of Vibration Galvanometer
      • The Motor-Driven Commercial Vehicle
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