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      Knowledge is Power

      Scientific American February 1929

      In The Birthplace of Pure Iron

      Removing Impurities From Smelted Iron Greatly Increases Its Usefulness

      • February 1, 1929

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      More in the February 1929 issue of Scientific American
      • Are We Slowing Down?, Employers' Shop Rights and more
      • From the Scrap-book of Science, February 1929
      • Picturing Skill in Golf
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