@misc{indiciaedfd90bf247f4,
  title = {The difference between the potentiometric surfaces of the lower Patapsco aquifer, September 1990 and September 2001 in southern Maryland},
  author = {Stephen E. Curtin and David C. Andreasen and Judith C. Wheeler},
  year = {2002},
  doi = {10.3133/ofr2002449},
  url = {https://pubs.usgs.gov/publication/ofr2002449},
  note = {Source identifier: ofr2002449}
}