@misc{indiciae6da9faefbacc,
  title = {Preliminary geologic map of the White Butte NW Quadrangle, Stark and Hettinger counties, North Dakota},
  author = {Kenneth S. Soward},
  year = {1972},
  doi = {10.3133/ofr72356},
  url = {https://pubs.usgs.gov/publication/ofr72356},
  note = {Source identifier: ofr72356}
}