@misc{indiciaec81960fd4cb5,
  title = {Geologic map of the New Richmond quadrangle, Kentucky–Ohio},
  author = {A. B. Gibbons and Joseph James Kohut and Malcolm P. Weiss},
  year = {1975},
  doi = {10.3133/gq1228},
  url = {https://pubs.usgs.gov/publication/gq1228},
  note = {Source identifier: gq1228}
}