@misc{indiciae5e0f0d49893d,
  title = {Distribution of hydrogeologic units in the Black Hills area, South Dakota},
  author = {Michael L. Strobel and Gregory J. Jarrell and J. Foster Sawyer and John R. Schleicher and Mark D. Fahrenbach},
  year = {1999},
  doi = {10.3133/ha743},
  url = {https://pubs.usgs.gov/publication/ha743},
  note = {Source identifier: ha743}
}