@misc{indiciae64fa9bc84cfa,
  title = {The Cannonball River lignite field, Morton, Adams, and Hettinger Counties, North Dakota},
  author = {E. R. Lloyd},
  year = {1914},
  doi = {10.3133/b541g},
  url = {https://pubs.usgs.gov/publication/b541G},
  note = {Source identifier: b541G}
}