@misc{indiciaef888a6771694,
  title = {Flow of ground water through fractured carbonate rocks in the Prairie du Chien-Jordan Aquifer, southeastern Minnesota},
  author = {J. F. Ruhl},
  year = {1989},
  doi = {10.3133/ofr89253},
  url = {https://pubs.usgs.gov/publication/ofr89253},
  note = {Source identifier: ofr89253}
}