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      Knowledge is Power

      Scientific American June 19, 1909

      The Greatest Altitudes Attained by Unmanned Sounding Balloons

      • By A. Wagner on June 19, 1909

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      More in the June 19, 1909 issue of Scientific American
      • Building Bricks of Glass
      • Lantern Projection Distances
      • Sir George Darwin on “Tides in the Solid Earth.”
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