@misc{indiciae3cfbd33d30cc,
  title = {Potentiometric Surface of the Upper Patapsco Aquifer in Southern Maryland, September 2001},
  author = {Stephen E. Curtin and David C. Andreasen and Judith C. Wheeler},
  year = {2002},
  doi = {10.3133/ofr02446},
  url = {https://pubs.usgs.gov/publication/ofr02446},
  note = {Source identifier: ofr02446}
}