@misc{indiciae6c06100b0c86,
  title = {Geologic map of the Wallins Creek quadrangle, Harlan and Bell Counties, Kentucky},
  author = {A.J. Froelich},
  year = {1972},
  doi = {10.3133/gq1016},
  url = {https://pubs.usgs.gov/publication/gq1016},
  note = {Source identifier: gq1016}
}