@misc{indiciae5896674f11d8,
  title = {Federal coal resource occurrence and federal coal development maps of the Krebs 7.5 minute quadrangle, Pittsburg County, Oklahoma},
  author = {Geological Services of Tulsa and B. T. Brady and J. L. Querry},
  year = {1980},
  doi = {10.3133/ofr79301},
  url = {https://pubs.usgs.gov/publication/ofr79301},
  note = {Source identifier: ofr79301}
}