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      Scientific American April 19, 1919

      How Big is Our Merchant Fleet?, The Advent of Colloidal Fuel and more

      • April 19, 1919

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      More in the April 19, 1919 issue of Scientific American
      • Recently Patented Inventions - April 19, 1919
      • The Service of the Chemist
      • Locating Unexploded Shells on the Battlefields of France
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