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      Scientific American April 20, 1918

      Present Day Problems of Plant Geography—I

      As Related to the Necessity for Intensified Production

      • By Jean Dufrenoy on April 20, 1918

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      More in the April 20, 1918 issue of Scientific American
      • Coal used by Locomotives
      • The Nearest Star
      • Double Compounds of the Metallic Halides with Ether
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