@misc{indiciae747fc1eafe71,
  title = {A thick coal bed near Lake De Smet, Johnson County, Wyoming},
  author = {W. J. Mapel and J. M. Schopf and J. R. Gill},
  year = {1953},
  doi = {10.3133/cir228},
  url = {https://pubs.usgs.gov/publication/cir228},
  note = {Source identifier: cir228}
}