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      Scientific American April 02, 1921

      The Heavens in April, 1921

      The Tidal Friction and the Toll It Takes

      • By Henry Norris Russell on April 2, 1921

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      More in the April 02, 1921 issue of Scientific American
      • Twelve Hundred Charts at a Third of a Cent
      • An Extinct Sea Lizard from Western Kansas
      • Jobs for Sawdust
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