WHAT ALL HAPPENED ON 9. SEPTEMBER 1972
Look what happened on 9. September 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. (9. September 1972)
WHAT ALL HAPPENED ON SEPTEMBER 9. 1972. Look what happened on September 9. 1972.
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