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      Knowledge is Power

      Scientific American June 14, 1919

      Valuable By-Products from Gold Dredging

      • By Arthur L. Dahl on June 14, 1919

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      More in the June 14, 1919 issue of Scientific American
      • Invention as the Foundation of the Nation's Wealth
      • The United States Patent Office as a National Asset, Rabies and the Public Health Problem and more
      • Inventions New and Interesting - June 14, 1919
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