@misc{indiciae496ea5950876,
  title = {Federal coal resource occurrence map of the northeast quarter of the Heavener 15-minute quadrangle, LeFlore County, Oklahoma},
  author = {J. L. Querry and Geological Services of Tulsa},
  year = {1985},
  doi = {10.3133/ofr79498},
  url = {https://pubs.usgs.gov/publication/ofr79498},
  note = {Source identifier: ofr79498}
}