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      Knowledge is Power

      Scientific American October 20, 1894

      On the Presence in Paper of Residual Chemicals used in its Preparation

      • By Robert Irvine, G. Sims Woodhead on October 20, 1894

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      More in the October 20, 1894 issue of Scientific American
      • A Typical Gold Mine
      • The Distribution of Compressed Air in Paris
      • The Paris Observatory—The Oldest and Newest Telescopes
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