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      Knowledge is Power

      Scientific American April 12, 1919

      Salvage Work in New York Harbor

      Raising of Sunken Barges and Other Harbor Craft a Frequent Necessity Photos copyright by Press Illustrating Service

      • April 12, 1919

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      More in the April 12, 1919 issue of Scientific American
      • Long-Range Guns
      • Rubber Substitute from German Plants
      • The Louse that Annoys Armies abroad and People at Home
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