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      Scientific American June 28, 1919

      Germany's Aircraft Experimental Station, Subterranean Noises in Australia

      • June 28, 1919

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      More in the June 28, 1919 issue of Scientific American
      • Mud Geysers at Salton Sea, New Lead-Burning Transformer for Storage Battery Work and more
      • How the House Fly Takes Hold
      • Recently Patented Inventions - June 28, 1919
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