@misc{indiciaeb732117dfb5d,
  title = {Updated database and mine locations for metallic mineral districts and mines of the Black Hills, South Dakota and Wyoming},
  author = {A.B. Wilson and Ed DeWitt},
  year = {1995},
  doi = {10.3133/ofr9566a},
  url = {https://pubs.usgs.gov/publication/ofr9566A},
  note = {Source identifier: ofr9566A}
}