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      Knowledge is Power

      Scientific American May 04, 1918

      The Heavens in May, 1918

      How the Astronomer Makes the Vastness of Space Give Up Its Secrets

      • By Henry Norris Russell on May 4, 1918

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      More in the May 04, 1918 issue of Scientific American
      • A Weeder Attachment for Cultivators, A New Tillage Tool
      • Inventions New and Interesting- May 4, 1918
      • Mechanical Equipment of the Farm- May 4, 1918
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