@misc{indiciae13485f7730bd,
  title = {Potentiometric surface of the lower Patapsco Aquifer in southern Maryland, September 1993},
  author = {Stephen E. Curtin and Frederick K. Mack and D. C. Andreasen},
  year = {1994},
  doi = {10.3133/ofr94393},
  url = {https://pubs.usgs.gov/publication/ofr94393},
  note = {Source identifier: ofr94393}
}