@misc{indiciae7823ebe42a67,
  title = {The difference between the potentiometric surfaces of the Magothy Aquifer of September 1986 and September 1988 in southern Maryland},
  author = {Frederick K. Mack and David C. Andreasen and Stephen E. Curtin and Judith C. Wheeler},
  year = {1990},
  doi = {10.3133/wri904038},
  url = {https://pubs.usgs.gov/publication/wri904038},
  note = {Source identifier: wri904038}
}