@misc{indiciaef117d94ca6c5,
  title = {Geologic map of the Hudgins quadrangle, Green and Hart Counties, Kentucky},
  author = {R.C. Miller and Samuel L. Moore},
  year = {1969},
  doi = {10.3133/gq834},
  url = {https://pubs.usgs.gov/publication/gq834},
  note = {Source identifier: gq834}
}