@misc{indiciaef22c45c2438d,
  title = {Water-resources activities of the U.S. Geological Survey in Illinois, 1993},
  author = {G. O. Balding},
  year = {1994},
  doi = {10.3133/ofr94493},
  url = {https://pubs.usgs.gov/publication/ofr94493},
  note = {Source identifier: ofr94493}
}