@misc{indiciaec67ba1a3f4ef,
  title = {Spirit leveling in New Mexico 1902 to 1915, inclusive},
  author = {Robert Bradford Marshall},
  year = {1916},
  doi = {10.3133/b638},
  url = {https://pubs.usgs.gov/publication/b638},
  note = {Source identifier: b638}
}