@misc{indiciaefd8e6a006beb,
  title = {Federal coal resource occurrence and federal coal potential maps of the Hackett 7.5-minute quadrangle, Le Flore County, Oklahoma, and Sebastian County, Arkansas},
  author = {J. L. Querry and Geological Services of Tulsa},
  year = {1985},
  doi = {10.3133/ofr79497},
  url = {https://pubs.usgs.gov/publication/ofr79497},
  note = {Source identifier: ofr79497}
}