@misc{indiciaefbec47825466,
  title = {Results of spirit leveling in Arkansas, Louisiana, and Mississippi 1896 to 1909, inclusive},
  author = {Robert Bradford Marshall},
  year = {1911},
  doi = {10.3133/b458},
  url = {https://pubs.usgs.gov/publication/b458},
  note = {Source identifier: b458}
}