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      Scientific American July 1923

      Uncle Sam's Agricultural Proving Grounds

      The Federal Farms Where Problems of Vital Import to American Agriculture Are Investigated

      • By Ralph Howard on July 1, 1923

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      More in the July 1923 issue of Scientific American
      • Civil Engineering Notes, July 1923
      • Fighting the Mosquito
      • Mechanical Engineering Notes, July 1923
      View Full Contents
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