@misc{indiciae1639f974087a,
  title = {Results of spirit leveling in Maine, New Hampshire, and Vermont, 1896 to 1909, inclusive},
  author = {Robert Bradford Marshall},
  year = {1910},
  doi = {10.3133/b437},
  url = {https://pubs.usgs.gov/publication/b437},
  note = {Source identifier: b437}
}