@misc{indiciae02feaa3d8a69,
  title = {Laboratory study of uranium-bearing lignite from western North Dakota and South Dakota},
  author = {James M. Schopf and Ralph J. Gray and Charles J. Felix},
  year = {1955},
  doi = {10.3133/tei572},
  url = {https://pubs.usgs.gov/publication/tei572},
  note = {Source identifier: tei572}
}