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      Knowledge is Power

      Scientific American July 1916

      The Playful Porpoise and its Economic Value, Cost of Brick Roads in the Country, and more

      • By Robert G. Skerrett on July 1, 1916

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      More in the July 1916 issue of Scientific American
      • New Books, Etc.- July 1, 1916
      • Strategic Moves of the War, June 22nd, 1916
      • Industrial Preparedness for Peace- July 1, 1916
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