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      Knowledge is Power

      Scientific American March 05, 1921

      Air Plus Oil Equals More Oil

      How Compressed Air Takes the Place of Natural Gas in Stimulating the Flow of Old Wells

      • By Robert G. Skerrett on March 5, 1921

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      More in the March 05, 1921 issue of Scientific American
      • From the Einstein Contest--III
      • The Papaya, or Tree Melon
      • Inventions New and Interesting
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