@misc{indiciaef289b9545005,
  title = {Results of spirit leveling in Arizona, 1899 to 1915, inclusive},
  author = {Robert Bradford Marshall},
  year = {1915},
  doi = {10.3133/b573},
  url = {https://pubs.usgs.gov/publication/b573},
  note = {Source identifier: b573}
}