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      Knowledge is Power

      Scientific American September 21, 1918

      Carbonization of Wood in Inclined Retorts at Varta Gasworks, Stockholm

      • September 21, 1918

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      More in the September 21, 1918 issue of Scientific American
      • A Test for Damaged Wheat
      • Draining the Zuider Zee
      • On the Correction of Optical Surfaces
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