@misc{indiciae736554100d7b,
  title = {The difference between the potentiometric surfaces of the Magothy Aquifer of September 1975 and September 1993 in southern Maryland},
  author = {Stephen E. Curtin and Frederick K. Mack and D. C. Andreasen},
  year = {1994},
  doi = {10.3133/ofr94395},
  url = {https://pubs.usgs.gov/publication/ofr94395},
  note = {Source identifier: ofr94395}
}