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      Scientific American July 31, 1897

      The Heavens for August - July 31, 1897

      • By William R. Brooks on July 31, 1897

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      More in the July 31, 1897 issue of Scientific American
      • Extension of the Underground Trolley System in New York
      • Patents - July 31, 1897
      • The Manufacture of Beet Sugar
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