@misc{indiciae72d6c7888bbd,
  title = {Belle Fourche folio, South Dakota},
  author = {Nelson Horatio Darton and Cleophas Cisney O’Harra},
  year = {1909},
  doi = {10.3133/gf164},
  url = {https://pubs.usgs.gov/publication/gf164},
  note = {Source identifier: gf164}
}