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      Knowledge is Power

      Scientific American January 29, 1921

      Where the Printer gets his Ink

      America's Carbon-Black Industry and the Methods it Employs

      • By Henry P. Westcott on January 29, 1921

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      More in the January 29, 1921 issue of Scientific American
      • Are We Abusing Our Water Resources?
      • Recently Patented Inventions
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