@misc{indiciaed214e29a2ea2,
  title = {Quality and petrographic characteristics of Paleocene coals from the Hanna basin, Wyoming},
  author = {B.S. Pierce},
  year = {1996},
  doi = {10.1016/0146-6380(96)00016-2},
  url = {https://pubs.usgs.gov/publication/70019366},
  note = {Source identifier: 70019366}
}