@misc{indiciae047e760568ee,
  title = {Status report: USGS coal assessment of the Powder River Basin, Wyoming},
  author = {James A. Luppens and Timothy J. Rohrbacher and Jon E. Haacke and David C. Scott and Lee M. Osmonson},
  year = {2006},
  doi = {10.3133/ofr20061072},
  url = {https://pubs.usgs.gov/publication/ofr20061072},
  note = {Source identifier: ofr20061072}
}