@misc{indiciae5ea850d1002b,
  title = {Map showing the potentiometeric surface of the Magothy Aquifer in southern Maryland, September 1977},
  author = {Frederick K. Mack and J. C. Wheeler and Stephen E. Curtin},
  year = {1978},
  doi = {10.3133/ofr78999},
  url = {https://pubs.usgs.gov/publication/ofr78999},
  note = {Source identifier: ofr78999}
}