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      Knowledge is Power

      Scientific American June 1997

      50, 100 and 150 Years Ago: Competition for Lead, Fluorine Liquefied and Astrophotography

      Articles from the Scientific American archive

      • June 1, 1997

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      More in the June 1997 issue of Scientific American
      • Decaffeinating Coffee--Working Knowledge
      • Gene Therapy for Cancer
      • Lung Cancer in U.S. Males
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