@misc{indiciae92e7a6ebbe7e,
  title = {Preliminary report on near-surface lignite occurrences, Cleveland County, Arkansas},
  author = {Stephen E. Heermann},
  year = {1983},
  doi = {10.3133/ofr8353},
  url = {https://pubs.usgs.gov/publication/ofr8353},
  note = {Source identifier: ofr8353}
}