@misc{indiciaecc5f5621503e,
  title = {Spirit leveling in Arkansas, 1896 to 1915, inclusive},
  author = {Robert Bradford Marshall},
  year = {1916},
  doi = {10.3133/b636},
  url = {https://pubs.usgs.gov/publication/b636},
  note = {Source identifier: b636}
}