@misc{indiciae48d423cdc0ba,
  title = {Surface water supply of the United States, 1966-70, Part 5, Hudson Bay and upper Mississippi River basins, v. 2, Upper Mississippi River basin above Keokuk, Iowa},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/wsp2114},
  url = {https://pubs.usgs.gov/publication/wsp2114},
  note = {Source identifier: wsp2114}
}