@misc{indiciaef125fd8dd405,
  title = {The difference between the potentiometric surfaces of the Aquia Aquifer of September 1982 and September 1993 in southern Maryland},
  author = {Stephen E. Curtin and Frederick K. Mack and D. C. Andreasen},
  year = {1994},
  doi = {10.3133/ofr94394},
  url = {https://pubs.usgs.gov/publication/ofr94394},
  note = {Source identifier: ofr94394}
}