@misc{indiciaed58c3563b8a3,
  title = {Geologic map of the Breckinridge quadrangle, Harrison and Scott Counties, Kentucky},
  author = {Roberts Manning Wallace},
  year = {1977},
  doi = {10.3133/gq1344},
  url = {https://pubs.usgs.gov/publication/gq1344},
  note = {Source identifier: gq1344}
}