@misc{indiciae733b623785f1,
  title = {Exploration for beryllium at the Helen Beryl, Elkhorn, and Tin Mountain pegmatites, Custer County, South Dakota},
  author = {M.H. Staatz and L. R. Page and J.J. Norton and V.R. Wilmarth},
  year = {1963},
  doi = {10.3133/pp297c},
  url = {https://pubs.usgs.gov/publication/pp297C},
  note = {Source identifier: pp297C}
}