@misc{indiciaed3ab8815cdea,
  title = {White Spar mica mine, Custer County, South Dakota},
  author = {L. R. Page and J.J. Norton},
  year = {1943},
  doi = {10.3133/ofr4378},
  url = {https://pubs.usgs.gov/publication/ofr4378},
  note = {Source identifier: ofr4378}
}