@misc{indiciae1d0b9fc8e71f,
  title = {Results of spirit leveling in Nebraska, 1896 to 1913, inclusive},
  author = {Robert Bradford Marshall},
  year = {1914},
  doi = {10.3133/b572},
  url = {https://pubs.usgs.gov/publication/b572},
  note = {Source identifier: b572}
}