@misc{indiciae24b0ddc68d62,
  title = {Chemical analyses of coal from the Krebs Group (Pennsylvanian) Arkoma Basin, eastern Oklahoma},
  author = {Ricky T. Hildebrand},
  year = {1981},
  doi = {10.3133/ofr81894},
  url = {https://pubs.usgs.gov/publication/ofr81894},
  note = {Source identifier: ofr81894}
}