@misc{indiciaeec00a07a93ff,
  title = {The Williston lignite field, Williams County, North Dakota},
  author = {F. A. Herald},
  year = {1913},
  doi = {10.3133/b531e},
  url = {https://pubs.usgs.gov/publication/b531E},
  note = {Source identifier: b531E}
}