@misc{indiciae15d9669b0af7,
  title = {A preliminary report of a recently discovered aquifer at Sioux Falls, South Dakota},
  author = {Kenneth D. Vaughan and Earl A. Ackroyd},
  year = {1968},
  url = {https://pubs.usgs.gov/publication/70171724},
  note = {Source identifier: 70171724}
}