July 1, 1960
1 min read
Prehistoric Man in Mammoth Cave
Some 2,000 years ago Indians went deep into the great cavern in Kentucky to mine gypsum, leaving behind them many traces of a society that was just beginning to develop agriculture
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July 1, 1960
1 min read
Prehistoric Man in Mammoth Cave
Some 2,000 years ago Indians went deep into the great cavern in Kentucky to mine gypsum, leaving behind them many traces of a society that was just beginning to develop agriculture