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      Knowledge is Power

      Scientific American May 22, 1909

      Latrodectus--The Poisonous Spider

      • By Alexander Petrunkevitch on May 22, 1909

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      More in the May 22, 1909 issue of Scientific American
      • Col. J. J. Astor's Vibratory Disintegrator
      • Index of Inventions - May 22, 1909
      • Recently Patented Inventions - May 22, 1909
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