@misc{indiciae03e703b1033d,
  title = {Geologic map of the Claysville Quadrangle, northeastern Kentucky},
  author = {Stanley J. Luft},
  year = {1975},
  doi = {10.3133/ofr75115},
  url = {https://pubs.usgs.gov/publication/ofr75115},
  note = {Source identifier: ofr75115}
}