@misc{indiciae6b9137b7c512,
  title = {Potentiometric surface of the Aquia Aquifer in southern Maryland, September 1991},
  author = {Stephen E. Curtin and D. C. Andreasen and Frederick K. Mack},
  year = {1993},
  doi = {10.3133/ofr93652},
  url = {https://pubs.usgs.gov/publication/ofr93652},
  note = {Source identifier: ofr93652}
}