@misc{indiciaec019ce45480f,
  title = {Difference between the potentiometric surfaces of the Lower Patapsco aquifer in southern Maryland, September 1990 and September 2009},
  author = {Stephen E. Curtin and David C. Andreasen and Andrew W. Staley},
  year = {2010},
  doi = {10.3133/ofr20101208},
  url = {https://pubs.usgs.gov/publication/ofr20101208},
  note = {Source identifier: ofr20101208}
}