@misc{indiciae91023750a8be,
  title = {Database for metallic mineral districts and mines of the Black Hills, South Dakota and Wyoming},
  author = {Anna B. Wilson and Ed DeWitt},
  year = {1992},
  doi = {10.3133/ofr92523c},
  url = {https://pubs.usgs.gov/publication/ofr92523C},
  note = {Source identifier: ofr92523C}
}