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      Knowledge is Power

      Scientific American October 08, 1921

      The Hudson River Caissons

      Giant Shafts from Which the Vehicular Tunnel Will be Built and Later Ventilated

      • By Robert G. Skerrett on October 8, 1921

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      More in the October 08, 1921 issue of Scientific American
      • Fighting the Water Hyacinth
      • High Pressure Steam
      • Inventions New and Interesting
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