@misc{indiciae6533269b26a8,
  title = {Map showing how the potentiometric surface of the Magothy Aquifer of September 1979 differed from the potentiometric surface of September 1977 in southern Maryland},
  author = {Frederick K. Mack and J. C. Wheeler and Stephen E. Curtin},
  year = {1981},
  doi = {10.3133/ofr81632},
  url = {https://pubs.usgs.gov/publication/ofr81632},
  note = {Source identifier: ofr81632}
}