@misc{indiciaec0b3b95479eb,
  title = {Results of spirit leveling in Oregon, 1896 to 1913, inclusive},
  author = {Robert Bradford Marshall},
  year = {1914},
  doi = {10.3133/b556},
  url = {https://pubs.usgs.gov/publication/b556},
  note = {Source identifier: b556}
}