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      Knowledge is Power

      Scientific American July 1927

      America's Longest Tunnel

      Rapid Construction of the Greatest Tunnel to be Built In the New World

      • By Charles F. A. Mann on July 1, 1927

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      More in the July 1927 issue of Scientific American
      • Commercial Property News, July 1927
      • Is Mars Habitable?
      • Radio Notes, July 1927
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