@misc{indiciaec464e524189e,
  title = {Geology of the Pierre quadrangle, South Dakota},
  author = {Dwight Raymond Crandell},
  year = {1954},
  doi = {10.3133/gq32},
  url = {https://pubs.usgs.gov/publication/gq32},
  note = {Source identifier: gq32}
}