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      Knowledge is Power

      Scientific American August 17, 1867

      A Uniform System of Coinage and the Proper Ratio of Values

      • August 17, 1867

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      More in the August 17, 1867 issue of Scientific American
      • Dangers of the Gas Made from the Volatile Constituents of Petroleum
      • Manufacture of Magnesium and Sodium
      • Recent American and Foreign Patents
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