@misc{indiciaeb24087ef9925,
  title = {Geology and coal deposits of the Coal City quadrangle, Greene, Clay, and Owen Counties, Indiana},
  author = {Frank Edward Kottlowski},
  year = {1959},
  doi = {10.3133/coal28},
  url = {https://pubs.usgs.gov/publication/coal28},
  note = {Source identifier: coal28}
}