@misc{indiciae0a7b864a2fbe,
  title = {Geology and ground-water resources of North Dakota, with a discussion of the chemical character of the water},
  author = {Howard E. Simpson and Harry Buchholz Riffenburg},
  year = {1929},
  doi = {10.3133/wsp598},
  url = {https://pubs.usgs.gov/publication/wsp598},
  note = {Source identifier: wsp598}
}