@misc{indiciae184defd04e21,
  title = {U.S. Geological Survey ground-water studies in Maryland},
  author = {B.J. Ryan},
  year = {1988},
  doi = {10.3133/ofr88133},
  url = {https://pubs.usgs.gov/publication/ofr88133},
  note = {Source identifier: ofr88133}
}