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      Scientific American October 19, 1889

      The Pits and Domes of Mammoth Cave

      • By H. C. Hovey on October 19, 1889

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      More in the October 19, 1889 issue of Scientific American
      • Business and Personal- October 19, 1889
      • Notes and Queries- October 19, 1889
      • An Improved Door Bolt
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