@misc{indiciae2b71361738e0,
  title = {Preliminary report on stratigraphy and depositional environments of the lignites in the Fort Union Formation, west-central North Dakota},
  author = {Edward A. Rehbein},
  year = {1976},
  doi = {10.3133/ofr7769},
  url = {https://pubs.usgs.gov/publication/ofr7769},
  note = {Source identifier: ofr7769}
}