Passageway, Historic Tour, Mammoth Cave National Park, Kentucky
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Passageway, Historic Tour, Mammoth Cave National Park, Kentucky
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Calcite Formations, New Entrance Tour, Mammoth Cave National Park, Kentucky
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Drapery room stalagmite, New Entrance Tour, Mammoth Cave National Park, Kentucky
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Frozen Niagara calcite formation, New Entrance Tour, Mammoth Cave National Park, Kentucky
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