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      Knowledge is Power

      Scientific American February 27, 1915

      Roman Technics and Industry in Early Germany

      A Commercial and Technical as well as a Political Conquest

      • February 27, 1915

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      More in the February 27, 1915 issue of Scientific American
      • Mathematics and Artillery Science
      • The Chemistry of the Incandescent Gas Mantle
      • “Standardizing” the Art of Voice Production
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