@misc{indiciaeb28475b11173,
  title = {Geologic Map of the Round Spring Quadrangle, Shannon County, Missouri},
  author = {Randall C. Orndorff and David J. Weary},
  year = {2009},
  doi = {10.3133/sim3073},
  url = {https://pubs.usgs.gov/publication/sim3073},
  note = {Source identifier: sim3073}
}