@misc{indiciae6e868d5a5fec,
  title = {Map showing altitude of the base of fresh water in coastal plain aquifers of the Mississippi embayment},
  author = {E. M. Cushing},
  year = {1966},
  doi = {10.3133/ha221},
  url = {https://pubs.usgs.gov/publication/ha221},
  note = {Source identifier: ha221}
}