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      Knowledge is Power

      Scientific American March 26, 1921

      Watermarking Hand-Made Papers

      Some of the Details of This Obscure Art, as Practiced in Ancient and Modern Times

      • By Dard Hunter on March 26, 1921

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      More in the March 26, 1921 issue of Scientific American
      • Relativity and a Rotating Disk
      • Railroad Accidents and How They Work, Our Attitude Toward the Port and Harbor Plan and more
      • The Electric Battleship
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