@misc{indiciae14017702e897,
  title = {Geologic map of the Square Buttes district, Oliver and Mercer Counties, North Dakota},
  author = {William D. Johnson and Robert Paul Kunkel},
  year = {1954},
  doi = {10.3133/om148},
  url = {https://pubs.usgs.gov/publication/om148},
  note = {Source identifier: om148}
}