historical illustration
On This Day: In Kentucky's Mammoth Cave National Park, a Cave Research Foundation exploration... (1972)
Source: Today in History (history.muffinlabs.com) - CC BY-SA 3.062 words
On September 9, 1972: In Kentucky's Mammoth Cave National Park, a Cave Research Foundation exploration and mapping team discovers a link between the Mammoth and Flint Ridge cave systems, making it the longest known cave passageway in the world....
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