@misc{indiciaecec4445780fd,
  title = {Water resources data for Illinois},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1965},
  doi = {10.3133/845},
  url = {https://pubs.usgs.gov/publication/845},
  note = {Source identifier: 845}
}