@misc{indiciae8393d3050cf9,
  title = {Results of spirit leveling in West Virginia, 1909 and 1910},
  author = {Robert Bradford Marshall},
  year = {1911},
  doi = {10.3133/b477},
  url = {https://pubs.usgs.gov/publication/b477},
  note = {Source identifier: b477}
}