@misc{indiciae2f8567462ffb,
  title = {Geology and fuel resources of the southern part of the Oklahoma coal field},
  author = {Thomas A. Hendricks},
  year = {1937},
  doi = {10.3133/b874},
  url = {https://pubs.usgs.gov/publication/b874},
  note = {Source identifier: b874}
}