@misc{indiciae98044e94d61a,
  title = {Delineating the Pierre Shale from geophysical surveys within and near Ellsworth Air Force Base, South Dakota, 2019},
  author = {Colton J. Medler and Todd M. Anderson},
  year = {2021},
  doi = {10.3133/sim3474},
  url = {https://pubs.usgs.gov/publication/sim3474},
  note = {Source identifier: sim3474}
}