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      Scientific American August 14, 1915

      Improvised Defenses

      And Devices for the Improvement of Existing Cover

      • August 14, 1915

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      More in the August 14, 1915 issue of Scientific American
      • German Investments in the Dyestuffs Industry
      • John Muir in College
      • The Children's Room in the Smithsonian Institution
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