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      Scientific American February 15, 1919

      Canyon de Chelly of Arizona

      A Monument of Pre-Historic America

      • February 15, 1919

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      More in the February 15, 1919 issue of Scientific American
      • A World Language
      • Electric Heater for use in the Analytical Distillation of Gasoline
      • Industrial Waste Products—Methods of Reclamation
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