@misc{indiciae1f4ec706651d,
  title = {Geologic map of the Pennington Gap quadrangle, Lee County, Virginia, and Harlan County, Kentucky},
  author = {Ralph L. Miller and John B. Roen},
  year = {1973},
  doi = {10.3133/gq1098},
  url = {https://pubs.usgs.gov/publication/gq1098},
  note = {Source identifier: gq1098}
}