@misc{indiciae783ac85bf624,
  title = {Designation of principal water-supply aquifers in Minnesota},
  author = {D. G. Adolphson and J. F. Ruhl and R. J. Wolf},
  year = {1981},
  doi = {10.3133/wri8151},
  url = {https://pubs.usgs.gov/publication/wri8151},
  note = {Source identifier: wri8151}
}