@misc{indiciaecd3c0dfc569e,
  title = {Geologic map of the Russellville quadrangle, Logan County, Kentucky},
  author = {R.C. Miller},
  year = {1968},
  doi = {10.3133/gq714},
  url = {https://pubs.usgs.gov/publication/gq714},
  note = {Source identifier: gq714}
}