@misc{indiciae3ddd9c94ddcd,
  title = {Preliminary map showing the difference between the potentiometric surfaces of the Aquia aquifer of April 1979 and September 1982 in southern Maryland},
  author = {F. K. Mack and J. C. Wheeler and S. E. Curtin},
  year = {1984},
  doi = {10.3133/ofr83930},
  url = {https://pubs.usgs.gov/publication/ofr83930},
  note = {Source identifier: ofr83930}
}