@misc{indiciae8a595de755c4,
  title = {Geology of the Cumberland Gap area, Kentucky, Tennessee, and Virginia},
  author = {K. J. Englund and R. E. Thomas and J.B. Roen},
  year = {1994},
  url = {https://pubs.usgs.gov/publication/70186537},
  note = {Source identifier: 70186537}
}