@misc{indiciae522f06faccf1,
  title = {Generalized potentiometric surface of the aquifers in the Cockfield Formation, southeastern Arkansas, spring 1980},
  author = {D. J. Ackerman},
  year = {1987},
  doi = {10.3133/wri874212},
  url = {https://pubs.usgs.gov/publication/wri874212},
  note = {Source identifier: wri874212}
}