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      Memorial Day Sale

      Scientific American November 20, 1909

      The Preservation of Roads

      Tar as Applied to Surface Treatment

      • By Hervey J. Skinner on November 20, 1909

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      More in the November 20, 1909 issue of Scientific American
      • Charles Darwin and Mendelism
      • Superheated Steam Locomotives
      • Trade Notes and Formulæ
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