@misc{indiciae10bc84eef0dc,
  title = {Coal quality and major, minor, and trace elements in the Powder River, Green River, and Williston basins, Wyoming and North Dakota},
  author = {Gary D. Stricker and Romeo M. Flores and Michael H. Trippi and Margaret S. Ellis and Carol M. Olson and Jonah E. Sullivan and Kenneth I. Takahashi},
  year = {2007},
  doi = {10.3133/ofr20071116},
  url = {https://pubs.usgs.gov/publication/ofr20071116},
  note = {Source identifier: ofr20071116}
}