@misc{indiciae9ca8d8472957,
  title = {Hydrogeologic framework of the coastal plain of Maryland, Delaware, and the District of Columbia},
  author = {D.A. Vroblesky and W.B. Fleck},
  year = {1991},
  doi = {10.3133/pp1404e},
  url = {https://pubs.usgs.gov/publication/pp1404E},
  note = {Source identifier: pp1404E}
}