@misc{indiciae75ddfe79d5de,
  title = {Potentiometric surface of the Aquia aquifer in southern Maryland, September 1997},
  author = {Stephen E. Curtin and David C. Andreasen and Frederick K. Mack},
  year = {1999},
  doi = {10.3133/ofr9982},
  url = {https://pubs.usgs.gov/publication/ofr9982},
  note = {Source identifier: ofr9982}
}