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      Knowledge is Power

      Scientific American May 1909

      The Typhoid Fly or House Fly

      A Dangerous Common Insect

      • By L. O. Howard on May 1, 1909

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      More in the May 1909 issue of Scientific American
      • Submarine Minelayers
      • Trade Notes and Formulæ
      • Electrolytic Reduction of Indigo
      View Full Contents
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