@misc{indiciaef2149c589a62,
  title = {Preliminary geologic and structure map of the southwest part of the Cascade Springs quadrangle, Fall River County, South Dakota},
  author = {Edwin V. Post},
  year = {1959},
  doi = {10.3133/mf211},
  url = {https://pubs.usgs.gov/publication/mf211},
  note = {Source identifier: mf211}
}