@misc{indiciaec1ebd542bc94,
  title = {Geologic map of the Roxana quadrangle, Letcher and Harlan Counties, Kentucky},
  author = {Edwin K. Maughan},
  year = {1976},
  doi = {10.3133/gq1299},
  url = {https://pubs.usgs.gov/publication/gq1299},
  note = {Source identifier: gq1299}
}