@misc{indiciaefc9d699b7c1e,
  title = {Geologic map of the Shady Nook quadrangle, northeastern Kentucky},
  author = {Roberts Manning Wallace},
  year = {1975},
  doi = {10.3133/gq1261},
  url = {https://pubs.usgs.gov/publication/gq1261},
  note = {Source identifier: gq1261}
}