@misc{indiciae2749815a3492,
  title = {Geology of the Portal quadrangle, North Dakota},
  author = {Roland C. Townsend},
  year = {1954},
  doi = {10.3133/gq47},
  url = {https://pubs.usgs.gov/publication/gq47},
  note = {Source identifier: gq47}
}