@misc{indiciaead9f4b4f7cd6,
  title = {Data base for metallic mineral districts and mines of the northern Black Hills, South Dakota and Wyoming, Part A - Program documentation},
  author = {Anna Burack Wilson and Ed DeWitt},
  year = {1990},
  doi = {10.3133/ofr90424a},
  url = {https://pubs.usgs.gov/publication/ofr90424A},
  note = {Source identifier: ofr90424A}
}