@misc{indiciae2e4e0eef22ef,
  title = {Geologic map of the Rapid City East quadrangle, Pennington County, South Dakota},
  author = {John Mark Cattermole},
  year = {1970},
  doi = {10.3133/ofr7061},
  url = {https://pubs.usgs.gov/publication/ofr7061},
  note = {Source identifier: ofr7061}
}