@misc{indiciae32167e795a5b,
  title = {Summary description of the geologic environment of the Williston Basin lignite fields, North Dakota},
  author = {Donald Eldon Trimble},
  year = {1978},
  doi = {10.3133/ofr78920},
  url = {https://pubs.usgs.gov/publication/ofr78920},
  note = {Source identifier: ofr78920}
}