@misc{indiciae42a4f9e1eb23,
  title = {Assessment of Coal Geology, Resources, and Reserves in the Gillette Coalfield, Powder River Basin, Wyoming},
  author = {James A. Luppens and David C. Scott and Jon E. Haacke and Lee M. Osmonson and Timothy J. Rohrbacher and Margaret S. Ellis},
  year = {2008},
  doi = {10.3133/ofr20081202},
  url = {https://pubs.usgs.gov/publication/ofr20081202},
  note = {Source identifier: ofr20081202}
}