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      Knowledge is Power

      Scientific American October 20, 1894

      A Typical Gold Mine

      Incline Shaft and Lower Levels

      • By Arthur Lakes on October 20, 1894

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      More in the October 20, 1894 issue of Scientific American
      • On the Presence in Paper of Residual Chemicals used in its Preparation
      • The Distribution of Compressed Air in Paris
      • The Paris Observatory—The Oldest and Newest Telescopes
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