@misc{indiciae1c4321140e93,
  title = {Preliminary report on methodology for calculating coal resources of the Wyodak-Anderson coal zone, Powder River basin, Wyoming and Montana},
  author = {Margaret S. Ellis and Gregory L. Gunther and Romeo M. Flores and Gary D. Stricker and Allan M. Ochs and John H. Schuenemeyer},
  year = {1998},
  doi = {10.3133/ofr98789b},
  url = {https://pubs.usgs.gov/publication/ofr98789B},
  note = {Source identifier: ofr98789B}
}