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      Scientific American April 24, 1920

      Lilies of Stone

      A Curious Family of Water Animals That Has Survived from Fossil Times

      • By W. A. Butterfield on April 24, 1920

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      More in the April 24, 1920 issue of Scientific American
      • A Radial Gate for Irrigation Canals
      • The Geology of Ripple Marks
      • A Stranded School of Whales and what it Means
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