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      Scientific American August 06, 1921

      The Heavens in August, 1921

      Dark Voids in the Starry Skies, and what they Mean

      • By Henry Norris Russell on August 6, 1921

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      More in the August 06, 1921 issue of Scientific American
      • Depth-Bombing from the Air
      • Inventions New and Interesting
      • The Last Word in Power Houses, The World's Largest Watch and more
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