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      Scientific American July 15, 1916

      Aurora

      Earth Currents and Magnetic Disturbances

      • By Otto Klotz on July 15, 1916

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      More in the July 15, 1916 issue of Scientific American
      • How Long will our Oil Supply Last
      • Suffocating Gases and their Antidotes
      • Vitamin Solution of the Pellagra Problem
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