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      Knowledge is Power

      Scientific American July 07, 1917

      The Propagation of Electric Waves

      At the Surface of the Earth and the Ionized Stratum of the Atmosphere

      • By H. Nagaoka on July 7, 1917

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      More in the July 07, 1917 issue of Scientific American
      • An Era of New Food Resources
      • Galvanizing and Tinning Iron Wire
      • On the Greater use of Indian Foods
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