@misc{indiciae189d2be4f848,
  title = {Geology of the Standing Rock and Cheyenne River Indian Reservations, North and South Dakota},
  author = {William R. Calvert and A. L. Beekly and V. H. Barnett and M. A. Pishel},
  year = {1914},
  doi = {10.3133/b575},
  url = {https://pubs.usgs.gov/publication/b575},
  note = {Source identifier: b575}
}