@misc{indiciae712b1814c863,
  title = {The Spotted Horse coalfield, Sheridan and Campbell Counties, Wyoming},
  author = {Wilds W. Olive},
  year = {1957},
  doi = {10.3133/b1050},
  url = {https://pubs.usgs.gov/publication/b1050},
  note = {Source identifier: b1050}
}