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      Knowledge is Power

      Scientific American September 27, 1919

      The Heavens in October 1919

      The Comets Discovered by the Rev. Mr. Metcalf

      • By Henry Norris Russell on September 27, 1919

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      More in the September 27, 1919 issue of Scientific American
      • Inventions New and Interesting - September 27, 1919
      • Sells Fresh Fruit Juice, What Are Naval Stores?
      • The Stop-Watch in Industry
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