@misc{indiciae4f6fb6545114,
  title = {Preliminary geologic map of Rival no.2 quadrangle, North Dakota},
  author = {R. C. Townsend and Arthur L. Jenke},
  year = {1951},
  doi = {10.3133/ofr51174},
  url = {https://pubs.usgs.gov/publication/ofr51174},
  note = {Source identifier: ofr51174}
}