@misc{indiciae52661ecf80a5,
  title = {Geology and beryl deposits of the Peerless pegmatite, Pennington County, South Dakota},
  author = {Douglas M. Sheridan and Hal G. Stephens and Mortimer H. Staatz and James J. Norton},
  year = {1955},
  doi = {10.3133/tei226},
  url = {https://pubs.usgs.gov/publication/tei226},
  note = {Source identifier: tei226}
}