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      Knowledge is Power

      Scientific American May 19, 1917

      Gathering Turpentine

      Suggestions for Prolonging the Naval Stores Industry

      • By Samuel J. Record on May 19, 1917

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      More in the May 19, 1917 issue of Scientific American
      • Animals that make Trouble for Themselves
      • Life on Glaciers and Snow Fields
      • The Perception of Flashes of Light
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