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      Knowledge is Power

      Scientific American February 02, 1918

      Nitrate for Farmers at Cost, Trade Marks in Great Britain, and more

      • February 2, 1918

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      More in the February 02, 1918 issue of Scientific American
      • Recently Patented Inventions- February 2, 1918
      • Who Exports--And How?
      • Mechanical Equipment of the Farm
      View Full Contents
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