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      Scientific American May 10, 1919

      Shale Oil as a Business Proposition

      A Timely Word of Caution as to Processes, Costs and Profits

      • By H. L. Wood on May 10, 1919

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      More in the May 10, 1919 issue of Scientific American
      • Free as Air
      • Inventions New and Interesting - May 10, 1919
      • The Seagull Flies
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