@misc{indiciae6edf01d7916e,
  title = {Map showing how the potentiometric surface of the Magothy Aquifer of August 1980 differed from the potentiometric surface of September 1977, in southern Maryland},
  author = {Frederick K. Mack and J. C. Wheeler and Stephen E. Curtin},
  year = {1982},
  doi = {10.3133/ofr81631},
  url = {https://pubs.usgs.gov/publication/ofr81631},
  note = {Source identifier: ofr81631}
}