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      Knowledge is Power

      Scientific American December 21, 1912

      Plant Food in Relation to Soil Fertility

      The Problem of Restoring American Soil and Maintaining Prosperity

      • By Cyril G. Hopkins on December 21, 1912

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      More in the December 21, 1912 issue of Scientific American
      • Crystal Structure Revealed by Röntgen Rays
      • Scientific Incendiarism
      • The Synthesis of Ammonia from its Elements—I
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