@misc{indiciae3c7d541debf8,
  title = {Geology of the Fourmile pegmatite area, Custer County, South Dakota},
  author = {Jack Allison Redden},
  year = {1955},
  doi = {10.3133/ofr55145},
  url = {https://pubs.usgs.gov/publication/ofr55145},
  note = {Source identifier: ofr55145}
}