@misc{indiciaec13a2ff42439,
  title = {Difference between the potentiometric surfaces of the Magothy Aquifer in Fall of 1975 and Fall of 1986 in southern Maryland},
  author = {F. K. Mack and D. C. Andreasen and S. E. Curtin and J. C. Wheeler},
  year = {1987},
  doi = {10.3133/wri874217},
  url = {https://pubs.usgs.gov/publication/wri874217},
  note = {Source identifier: wri874217}
}