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      Scientific American December 27, 1879

      Determination of Potassa and Soda in Minerals

      • By W. Knop, J. Hazard on December 27, 1879

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      More in the December 27, 1879 issue of Scientific American
      • An Attempt at a Systematic Classification of the Various Forms of Energy
      • Coret's Metallic Thermometers
      • Heathorn's Steering Gear
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