@misc{indiciaede3dec9f5e1c,
  title = {Geology and water resources of the northern portion of the Black Hills and adjoining regions in South Dakota and Wyoming},
  author = {N. H. Darton},
  year = {1909},
  doi = {10.3133/pp65},
  url = {https://pubs.usgs.gov/publication/pp65},
  note = {Source identifier: pp65}
}