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      Knowledge is Power

      Scientific American September 04, 1915

      The Bee in Winter Time, Safety in Coal Mines and more

      • September 4, 1915

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      More in the September 04, 1915 issue of Scientific American
      • A Small Aero-Electric Plant
      • Tasks of German Inventors in Wartime
      • Strategic Moves of the War-August 25th, 1915
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