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      Knowledge is Power

      Scientific American September 02, 1916

      Bridge Building in New Zealand

      Interesting Designs That Have Been Successfully Erected

      • By Oliver Johnson on September 2, 1916

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      More in the September 02, 1916 issue of Scientific American
      • Fluxes for Oxy-Acetylene Welding
      • Photogenic Substance in the Firefly
      • Wave Proportions and their Effects
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