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      Knowledge is Power

      Scientific American July 19, 1919

      The Airship of the Near Future, The Romance of Invention and more

      • July 19, 1919

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      More in the July 19, 1919 issue of Scientific American
      • The Service of the Chemist
      • New Process for Cleaning Locomotives, The Percussion Cap and more
      • The Trans-Atlantic Dirigible
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