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      Knowledge is Power

      Scientific American September 07, 1889

      The Terrestrial Origin of the Oxygen Rays in the Solar Spectrum

      • By J. Janssen on September 7, 1889

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      More in the September 07, 1889 issue of Scientific American
      • Cognac and its Working Classes
      • Hydroquinone as a Developing Agent
      • Saccharification by means of Diastase
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