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      Scientific American April 15, 1911

      Our Typhoid Streams

      A Problem of National Importance

      • By H. de Parsons on April 15, 1911

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      More in the April 15, 1911 issue of Scientific American
      • Antiǵua—A City with a Wonderful Past
      • The Air-brake as Related to Proǵress in Locomotion—II
      • Ingenious Electric Switch Mechanism
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