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      Digital & 4-Year Archive

      Scientific American July 25, 1891

      Some Measurements in the Mammoth Cave of Indiana

      • By H. C. Hovey on July 25, 1891

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      More in the July 25, 1891 issue of Scientific American
      • Locust Visitations
      • An Improved Mortising Machine
      • Edison Dynamo and Motor
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