@misc{indiciae3fe3228229e8,
  title = {Potentiometric surface of the lower Patapsco Aquifer in southern Maryland, September 1991},
  author = {Stephen E. Curtin and D. C. Andreasen and Frederick K. Mack},
  year = {1993},
  doi = {10.3133/ofr93655},
  url = {https://pubs.usgs.gov/publication/ofr93655},
  note = {Source identifier: ofr93655}
}