@misc{indiciaec4079ac99d85,
  title = {Geologic map of the Rockholds quadrangle, Whitley and Knox Counties, Kentucky},
  author = {J. Hiram Smith},
  year = {1967},
  doi = {10.3133/gq677},
  url = {https://pubs.usgs.gov/publication/gq677},
  note = {Source identifier: gq677}
}