@misc{indiciaedb7fd82f38c1,
  title = {Difference between the potentiometric surfaces of the Aquia aquifer in spring of 1979 and fall of 1986 in southern Maryland},
  author = {F. K. Mack and D. C. Andreasen and S. E. Curtin and J. C. Wheeler},
  year = {1987},
  doi = {10.3133/wri874215},
  url = {https://pubs.usgs.gov/publication/wri874215},
  note = {Source identifier: wri874215}
}