@misc{indiciaecb8cb1da00cb,
  title = {Thickness of the Mississippi River Valley confining unit, eastern Arkansas},
  author = {Gerard Gonthier and Gary L. Mahon},
  year = {1993},
  doi = {10.3133/wri924121},
  url = {https://pubs.usgs.gov/publication/wri924121},
  note = {Source identifier: wri924121}
}