@misc{indiciaefcd4894ba59c,
  title = {Spirit leveling in Missouri, 1896-1938. Part 1, Southeastern Missouri, 1896-1937},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1938},
  doi = {10.3133/b898a},
  url = {https://pubs.usgs.gov/publication/b898A},
  note = {Source identifier: b898A}
}