@misc{indiciae14e0a1b6f745,
  title = {Potentiometric surfaces of the Mississippi River Valley alluvial aquifer in eastern Arkansas, spring 1972 and 1980},
  author = {D. J. Ackerman},
  year = {1989},
  doi = {10.3133/wri884075},
  url = {https://pubs.usgs.gov/publication/wri884075},
  note = {Source identifier: wri884075}
}