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      Celebrate Math Awareness Month

      Scientific American February 27, 1915

      The United States an Undefended Treasure Land - Part IV

      The Lesson That History Teaches

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      More in the February 27, 1915 issue of Scientific American
      • Equipping the Automobile for Travel, The Current Supplement and more
      • The Great International Panama-Pacific Exposition
      • The Largest Spider Web in the World
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