@misc{indiciaedc86c603e418,
  title = {Geologic map showing distribution of clinker in the Tertiary Fort Union and Wasatch formations, northern Powder River basin, Montana},
  author = {Edward L. Heffern and D. A. Coates and Jason Whiteman and M.S. Ellis},
  year = {1993},
  doi = {10.3133/coal142},
  url = {https://pubs.usgs.gov/publication/coal142},
  note = {Source identifier: coal142}
}