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      Scientific American August 21, 1909

      Ancient Marbles used in Modern Times

      The Sources of Ancient Stone Supply

      • By Mary Winearls Porter on August 21, 1909

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      More in the August 21, 1909 issue of Scientific American
      • Canning and Preserving Fruit.—III
      • Kieselgur or Infusorial Earth
      • Steam Turbines
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