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      Knowledge is Power

      Scientific American April 06, 1912

      Losses of Combined Nitroǵen

      An Important Chapter in World-Economics

      • By John D. Pennock on April 6, 1912

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      More in the April 06, 1912 issue of Scientific American
      • The Musical Memory and its Deranǵements
      • Aviation in the Sahara
      • Preservinǵ Good Roads
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