@misc{indiciae56f0adce50a6,
  title = {Geologic map of the Medicine Mountain Quadrangle, Pennington County, South Dakota},
  author = {J.C. Ratte},
  year = {1986},
  doi = {10.3133/i1654},
  url = {https://pubs.usgs.gov/publication/i1654},
  note = {Source identifier: i1654}
}