@misc{indiciaec321f08e99d5,
  title = {Potentiometric Surface of the Lower Patapsco Aquifer in Southern Maryland, September 2007},
  author = {Stephen E. Curtin and David C. Andreasen and Andrew W. Staley},
  year = {2009},
  doi = {10.3133/ofr20091086},
  url = {https://pubs.usgs.gov/publication/ofr20091086},
  note = {Source identifier: ofr20091086}
}