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      Scientific American June 15, 1912

      “Earth Liǵht”

      Or the Brightness, Exclusive of Star Light, of the Midnight Sky

      • By W. J. Humphreys on June 15, 1912

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      More in the June 15, 1912 issue of Scientific American
      • Makinǵ Ice with Heat
      • The Commercial Development of India Rubber
      • Turpentine from Dead and down Timber
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