@misc{indiciae93c5ffa8d02a,
  title = {A digital-computer model of the Big Sioux aquifer in Minnehaha County, South Dakota},
  author = {N.C. Koch},
  year = {1982},
  doi = {10.3133/wri824064},
  url = {https://pubs.usgs.gov/publication/wri824064},
  note = {Source identifier: wri824064}
}