@misc{indiciaeb1ca737526ef,
  title = {Results of spirit leveling in Indiana, 1897 to 1911, inclusive},
  author = {Robert Bradford Marshall},
  year = {1913},
  doi = {10.3133/b555},
  url = {https://pubs.usgs.gov/publication/b555},
  note = {Source identifier: b555}
}