@misc{indiciae0d3981b70536,
  title = {Preliminary report on the geology of the Zahl No. 3 Quadrangle, North Dakota},
  author = {Robert M. Lindvall and Wallace R. Hansen},
  year = {1948},
  doi = {10.3133/ofr488},
  url = {https://pubs.usgs.gov/publication/ofr488},
  note = {Source identifier: ofr488}
}