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      Knowledge is Power

      Scientific American August 06, 1921

      The Red Sea Dollar

      How a Trade Coin of More Than a Century's Standing Is Being Retired

      • By Frank Parker Stockbridge on August 6, 1921

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      More in the August 06, 1921 issue of Scientific American
      • Depth-Bombing from the Air
      • The Heavens in August, 1921
      • Inventions New and Interesting
      View Full Contents
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