@misc{indiciae58d9ccdd12f7,
  title = {Spirit leveling in North Carolina, 1896 to 1914, inclusive},
  author = {Robert Bradford Marshall},
  year = {1916},
  doi = {10.3133/b646},
  url = {https://pubs.usgs.gov/publication/b646},
  note = {Source identifier: b646}
}