@misc{indiciae15b251b1b305,
  title = {Geology of the Hill City quadrangle, Pennington County, South Dakota - a preliminary report},
  author = {James Clifford Ratte and Russell Gibson Wayland},
  year = {1969},
  doi = {10.3133/b1271b},
  url = {https://pubs.usgs.gov/publication/b1271B},
  note = {Source identifier: b1271B}
}