@misc{indiciae96a9f292a19b,
  title = {Geologic map of the Mason Quadrangle, Grant and Harrison Counties, Kentucky},
  author = {Stanley J. Luft},
  year = {1975},
  doi = {10.3133/ofr75116},
  url = {https://pubs.usgs.gov/publication/ofr75116},
  note = {Source identifier: ofr75116}
}