@misc{indiciaefc17a85d9b37,
  title = {Preliminary outcrop map, Rochford and vicinity, Black Hills, South Dakota, showing locations and values of samples analyzed selectively for Au, As, and Cu},
  author = {R. V. McGehee and R. W. Bayley and Rickie White},
  year = {1968},
  doi = {10.3133/ofr68171},
  url = {https://pubs.usgs.gov/publication/ofr68171},
  note = {Source identifier: ofr68171}
}