MammothCave-2

By Bruce Byers | Published September 13, 2019 | Full size is 650 × 488 pixels

Mammoth Cave Area Biosphere Reserve dedication plaque (1990) from the UNESCO Man and the Biosphere Program at the National Park Visitor Center

Mammoth Cave Area Biosphere Reserve dedication plaque (1990) from the UNESCO Man and the Biosphere Program at the National Park Visitor Center

Mammoth Cave Area Biosphere Reserve dedication plaque (1990) from the UNESCO Man and the Biosphere Program at the National Park Visitor Center

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