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by Roger W. Brucker and Richard A. Watson
In 1925 the geological connection between Flint Ridge and Mammoth Cave was proved when dye placed in a Flint Ridge spring showed up in Echo River at Mammoth Cave. That tantalizing swirl of dye confirmed speculations that wereto tempt more than 650cavers over half a century with the thrill of being the first to make human passage of the cave connection.
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