@misc{indiciaedbade0ff9106,
  title = {Potentiometric surface of the Aquia aquifer in southern Maryland, September 1989},
  author = {Frederick K. Mack and Stephen E. Curtin and David C. Andreasen and Judith C. Wheeler},
  year = {1991},
  doi = {10.3133/wri914094},
  url = {https://pubs.usgs.gov/publication/wri914094},
  note = {Source identifier: wri914094}
}