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      Knowledge is Power

      Scientific American December 1928

      Engine Ingenuity

      Novel Means Have Been Devised for Using Tractors to Lower Costs

      • December 1, 1928

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      More in the December 1928 issue of Scientific American
      • A Prehistoric Scene in Mongolia
      • Fibrous Wall Insulation, Daylight Lamp and more
      • Noise
      View Full Contents
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