@misc{indiciae0c8f1316fbf7,
  title = {Geology of the Coal Hill, Hartman, and Clarksville quadrangles, Johnson County and vicinity, Arkansas},
  author = {E.A. Merewether and B.R. Haley},
  year = {1969},
  doi = {10.3133/pp536c},
  url = {https://pubs.usgs.gov/publication/pp536C},
  note = {Source identifier: pp536C}
}