@misc{indiciae2014c4cb97e9,
  title = {Geology and beryl deposits of the Peerless pegmatite, Pennington County, South Dakota},
  author = {D. M. Sheridan and H.G. Stephens and M.H. Staatz and J.J. Norton},
  year = {1957},
  doi = {10.3133/pp297a},
  url = {https://pubs.usgs.gov/publication/pp297A},
  note = {Source identifier: pp297A}
}