@misc{indiciae62b3774a54f7,
  title = {Hydrogeologic atlas, Hereford quadrangle, Baltimore County, Maryland},
  author = {Mark T. Duigon and John T. Hilleary},
  year = {1981},
  url = {https://pubs.usgs.gov/publication/70047496},
  note = {Source identifier: 70047496}
}