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      Knowledge is Power

      Scientific American July 31, 1915

      The Heavens in August

      A Study of Short Period Variables

      • By Henry Norris Russell on July 31, 1915

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      More in the July 31, 1915 issue of Scientific American
      • Strategic Moves of the War--July 21st, 1915 and more
      • Railroad Building Under and Over the Streets of New York--III
      • Recently Patented Inventions - July 31, 1915
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