@misc{indiciae4f2d7586167e,
  title = {Geologic map of the Harlan quadrangle, Harlan County, Kentucky},
  author = {A.J. Froelich and E. J. McKay},
  year = {1972},
  doi = {10.3133/gq1015},
  url = {https://pubs.usgs.gov/publication/gq1015},
  note = {Source identifier: gq1015}
}