@misc{indiciae6c4e8c403882,
  title = {Geologic map and coal resources of the White Butte East quadrangle, Hettinger County, North Dakota},
  author = {Kenneth S. Soward},
  year = {1975},
  doi = {10.3133/coal70},
  url = {https://pubs.usgs.gov/publication/coal70},
  note = {Source identifier: coal70}
}