@misc{indiciaefa36af4068d8,
  title = {Results of spirit leveling in Wisconsin, 1897 to 1914, inclusive},
  author = {Robert Bradford Marshall},
  year = {1914},
  doi = {10.3133/b570},
  url = {https://pubs.usgs.gov/publication/b570},
  note = {Source identifier: b570}
}