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      Scientific American April 21, 1917

      A Volunteer System Spells Disaster, The General Public and the Food Problem, and more

      • April 21, 1917

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      More in the April 21, 1917 issue of Scientific American
      • American Sources of Nitrogen
      • Strategic Moves of the War--April 12th, 1917
      • Apparatus for Balancing High Speed Machinery
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