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      Knowledge is Power

      Scientific American August 30, 1919

      The Heavens in September, 1919

      The Census of the Stars and What We Know About Them

      • By Henry Norris Russell on August 30, 1919

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      More in the August 30, 1919 issue of Scientific American
      • Modern Machine Design in Old China, Ventilation of the Vehicular Tunnel, and more
      • Recently Patented Inventions - August 30, 1919
      • The James Watt Centenary
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