@misc{indiciae9273e802e141,
  title = {Geologic map of the Piqua quadrangle, northeastern Kentucky},
  author = {Roberts Manning Wallace},
  year = {1978},
  doi = {10.3133/gq1425},
  url = {https://pubs.usgs.gov/publication/gq1425},
  note = {Source identifier: gq1425}
}