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      Scientific American December 27, 1919

      Nature's Geometric Workmen

      Microscopic Animals that Lay Down Stone Skeletons of Amazing Form

      • By William Butterfield on December 27, 1919

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      More in the December 27, 1919 issue of Scientific American
      • Correspondence - December 27, 1919
      • Food versus Feed
      • Recently Patented Inventions - December 27, 1919
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