@misc{indiciae0eb4df440fae,
  title = {Geologic map of the Richardson quadrangle, Lawrence and Johnson Counties, Kentucky},
  author = {J. D. Sanchez and Donald Clayton Alvord and Philip Thayer Hayes},
  year = {1978},
  doi = {10.3133/gq1460},
  url = {https://pubs.usgs.gov/publication/gq1460},
  note = {Source identifier: gq1460}
}