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      Knowledge is Power

      Scientific American October 30, 1915

      The Great Gas Tunnel Under the East River

      A Battle with Floods Two Hundred Feet Below Sea Level

      • By J. F. Springer on October 30, 1915

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      More in the October 30, 1915 issue of Scientific American
      • Correspondence - October 30, 1915
      • Tennis as Compared to Golf
      • Aerial Range-Finding with Electrical "Ears"
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