@misc{indiciae9a10e7f99d57,
  title = {Spirit leveling in Texas 1896 to 1915, inclusive},
  author = {Robert Bradford Marshall},
  year = {1916},
  doi = {10.3133/b637},
  url = {https://pubs.usgs.gov/publication/b637},
  note = {Source identifier: b637}
}