@misc{indiciaee5652987fb30,
  title = {Geology and ground-water resources of the Lake Dakota Plain area, South Dakota},
  author = {William B. Hopkins and Lester R. Petri},
  year = {1963},
  doi = {10.3133/wsp1539t},
  url = {https://pubs.usgs.gov/publication/wsp1539T},
  note = {Source identifier: wsp1539T}
}