@misc{indiciaed69c3293072c,
  title = {The Difference Between the Potentiometric Surfaces of the Aquia Aquifer in Southern Maryland, September 1982 and September 2007},
  author = {Stephen E. Curtin and David C. Andreasen and Andrew W. Staley},
  year = {2009},
  doi = {10.3133/ofr20091081},
  url = {https://pubs.usgs.gov/publication/ofr20091081},
  note = {Source identifier: ofr20091081}
}