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Mammoth Cave: Coke bottles, ticket stubs, pre-historic debris discovered in world’s longest-known cave system

Camille Fine, USA TODAYComments Off on Mammoth Cave: Coke bottles, ticket stubs, pre-historic debris discovered in world’s longest-known cave system

Archeologists studying a mysterious passageway under the world's longest known cave system have found artifacts from over 200 years at Mammoth Cave.

      
Camille Fine, USA TODAY
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