@misc{indiciae84b42069cf07,
  title = {Potentiometric surface of the upper Patapsco aquifer in southern Maryland, September 1999},
  author = {Stephen E. Curtin and David C. Andreasen and Judith C. Wheeler},
  year = {2001},
  doi = {10.3133/ofr01208},
  url = {https://pubs.usgs.gov/publication/ofr01208},
  note = {Source identifier: ofr01208}
}