@misc{indiciae62ec9ee0b012,
  title = {Simulation of regional ground-water flow in the Cambrian-Ordovician aquifer system in the northern Midwest, United States: in Regional aquifer-system analysis},
  author = {R.J. Mandle and A.L. Kontis},
  year = {1992},
  doi = {10.3133/pp1405c},
  url = {https://pubs.usgs.gov/publication/pp1405C},
  note = {Source identifier: pp1405C}
}