@misc{indiciaee022e34ff205,
  title = {Geologic map of the Beech Grove quadrangle, western Kentucky},
  author = {G. M. Fairer and Ronald L. Norris and William D. Johnson},
  year = {1975},
  doi = {10.3133/gq1230},
  url = {https://pubs.usgs.gov/publication/gq1230},
  note = {Source identifier: gq1230}
}