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      Scientific American October 27, 1877

      Extraction of Copper by an Acid Solution of Ferrous Chloride

      • By M. A. Hauch on October 27, 1877

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      More in the October 27, 1877 issue of Scientific American
      • Asser's Photo-Lithographic Process
      • Coloring and Preserving Photographs
      • Hardening and Tempering Steel
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