@misc{indiciae6fe509f96de1,
  title = {Preliminary geologic map of the west-central part of the Minnekahta quadrangle, Fall River County, South Dakota},
  author = {V.R. Wilmarth and R.D. Smith},
  year = {1957},
  doi = {10.3133/mf67},
  url = {https://pubs.usgs.gov/publication/mf67},
  note = {Source identifier: mf67}
}