@misc{indiciae8a9da7b38eb8,
  title = {Geologic map and lignite deposits of the New Salem quadrangle, Morton County, North Dakota},
  author = {Henry L. Smith},
  year = {1973},
  doi = {10.3133/coal62},
  url = {https://pubs.usgs.gov/publication/coal62},
  note = {Source identifier: coal62}
}