Appalachian Unsolved: Trenny Gibson, missing in the Smokies

16-year-old Trenny Gibson went on a field trip Oct. 8, 1976, to the Great Smoky Mountains National Park with a group of about 35 classmates from Bearden High School. A bus dropped them off that Friday afternoon at Clingmans Dome, one of the most visited spots in the Smokies. She hasn't been seen since. http://bit.ly/2AShZBu

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