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      Knowledge is Power

      Scientific American January 25, 1908

      The Pennsylvania Tunnel Excavation Beneath Manhattan Completed

      • January 25, 1908

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      More in the January 25, 1908 issue of Scientific American
      • The Farman Aeroplane Wins the Deutsch-Archdeacon Prize
      • An Improved Portable Concrete Mixer
      • International Investigation of the Upper Air
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