@misc{indiciae261aa6f93849,
  title = {Result of spirit leveling in North Dakota, 1897 to 1910, inclusive},
  author = {Robert Bradford Marshall},
  year = {1911},
  doi = {10.3133/b469},
  url = {https://pubs.usgs.gov/publication/b469},
  note = {Source identifier: b469}
}