@misc{indiciae70ea51ac87cd,
  title = {Potentiometric surface of the Madison Aquifer in the Black Hills area, South Dakota},
  author = {Michael L. Strobel and Joel M. Galloway and Ghaith R. Hamade and Gregory L. Jarrell},
  year = {2000},
  doi = {10.3133/ha745d},
  url = {https://pubs.usgs.gov/publication/ha745D},
  note = {Source identifier: ha745D}
}