@misc{indiciaecfba22cf9591,
  title = {Regional correlation of the middle coal group of the Upper Cretaceous Mesaverde Group, Yampa coal field, Moffat and Routt counties, Colorado},
  author = {Edward A. Johnson and Michael E. Brownfield},
  year = {1988},
  doi = {10.3133/coal123},
  url = {https://pubs.usgs.gov/publication/coal123},
  note = {Source identifier: coal123}
}