@misc{indiciae2c9b2da2ac0c,
  title = {Results of spirit leveling in Oklahoma, 1895 to 1912, inclusive},
  author = {Robert Bradford Marshall},
  year = {1914},
  doi = {10.3133/b564},
  url = {https://pubs.usgs.gov/publication/b564},
  note = {Source identifier: b564}
}