@misc{indiciaedafd44d42acb,
  title = {Geologic map and coal resources of the White Butte NE quadrangle, Stark and Hettinger Counties, North Dakota},
  author = {Kenneth S. Soward},
  year = {1975},
  doi = {10.3133/coal72},
  url = {https://pubs.usgs.gov/publication/coal72},
  note = {Source identifier: coal72}
}