@misc{indiciae7f6ed2c9ffca,
  title = {Maps showing Quaternary geology of the northern Virginia part of the Chesapeake Bay},
  author = {Steven M. Colman and C. H. Hobbs},
  year = {1989},
  doi = {10.3133/mf1948b},
  url = {https://pubs.usgs.gov/publication/mf1948B},
  note = {Source identifier: mf1948B}
}