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      Knowledge is Power

      Scientific American September 25, 1915

      Some Rare Amphibians

      Valuable New Specimens at the New York Zoological Park

      • By Raymond L. Ditmars on September 25, 1915

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      More in the September 25, 1915 issue of Scientific American
      • Control and Protection of Electric Systems
      • Magnetization by Rotation
      • The Movements of the Moon
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