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      Spring Flash Sale

      Scientific American May 10, 1919

      Free as Air

      Legislation Needed to Control Aerial Traffic By Our Washington Correspondent

      • May 10, 1919

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      More in the May 10, 1919 issue of Scientific American
      • Shale Oil as a Business Proposition
      • Inventions New and Interesting - May 10, 1919
      • The Seagull Flies
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