@misc{indiciae4ddb1d90dabf,
  title = {Preliminary map showing the potentiometric surface of the Aquia Aquifer in southern Maryland, September 1982},
  author = {Frederick K. Mack and Judith C. Wheeler and Stephen E. Curtin},
  year = {1984},
  doi = {10.3133/ofr83929},
  url = {https://pubs.usgs.gov/publication/ofr83929},
  note = {Source identifier: ofr83929}
}