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      Knowledge is Power

      Scientific American May 02, 1903

      Hydrocyanic-Acid Gas against Household Insects

      • By L. O. Howard on May 2, 1903

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      More in the May 02, 1903 issue of Scientific American
      • Practical Air-Brake Instruction for Railroad Men
      • Voyages of the Ice-Breaker “Ermack”
      • Industrial Trusts
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