@misc{indiciaeb5879cede5da,
  title = {Geologic map of the Colesburg quadrangle, Hardin and Bullitt Counties, Kentucky},
  author = {Roy Clark Kepferle},
  year = {1967},
  doi = {10.3133/gq602},
  url = {https://pubs.usgs.gov/publication/gq602},
  note = {Source identifier: gq602}
}