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      Scientific American June 26, 1920

      The Heavens in July, 1920

      Where Matter Moves Seven Hundred and Fifty Miles a Second

      • By Henry Norris Russell on June 26, 1920

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      More in the June 26, 1920 issue of Scientific American
      • Index - June 26, 1920
      • Inventions New and Interesting - June 26, 1920
      • The Silent Teacher
      View Full Contents
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