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      Knowledge is Power

      Scientific American May 16, 1908

      Green Ammonio-Citrate of Iron for Preparing Blue-Print Paper

      • By Randolph Bolling on May 16, 1908

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      More in the May 16, 1908 issue of Scientific American
      • Elements of Electrical Engineering.—xvii
      • Life of a Radio-Active Element
      • The Cornu Helicopter
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