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      Knowledge is Power

      Scientific American September 19, 1896

      The Calumet and Hecla Copper Mine

      • By William P. Kibbie on September 19, 1896

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      More in the September 19, 1896 issue of Scientific American
      • A Novel Ball Bearing for Car Trucks
      • New Books and Publications - September 19, 1896
      • The Berlin Industrial Exhibition
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