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      Knowledge is Power

      Scientific American November 11, 1916

      Gilsonite and Grahamite: The Result of the Metamorphism of Petroleum under a Particular Environment

      • November 11, 1916

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      More in the November 11, 1916 issue of Scientific American
      • Bird Migration—II
      • High Versus Low Antennae in Radio Telegraphy and Telephony
      • The Minimum Radiation Visually Perceptible
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