@misc{indiciae7cd40eda577c,
  title = {Preliminary report on the lignite resources of the Niobe area, Burke and Ward counties, North Dakota},
  author = {Hal E. Owen},
  year = {1977},
  doi = {10.3133/ofr77379},
  url = {https://pubs.usgs.gov/publication/ofr77379},
  note = {Source identifier: ofr77379}
}