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      Knowledge is Power

      Scientific American September 09, 1911

      Variation in the Purchasinǵ Power of Gold

      • September 9, 1911

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      More in the September 09, 1911 issue of Scientific American
      • London's Electric Trains
      • Startinǵ a Gas Enǵine with Steam
      • The Sick Pearl Necklace of Madame thiers
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