@misc{indiciae181f1121ce90,
  title = {The difference between the potentiometric surfaces of the upper Patapsco aquifer, September 1990 and September 2003 in southern Maryland},
  author = {Stephen E. Curtin and David C. Andreasen and Judith C. Wheeler},
  year = {2005},
  doi = {10.3133/ofr20051009},
  url = {https://pubs.usgs.gov/publication/ofr20051009},
  note = {Source identifier: ofr20051009}
}