@misc{indiciaea39a35b2e798,
  title = {Geologic map of the Poolesville quadrangle, Frederick and Montgomery Counties, Maryland, and Loudoun County, Virginia},
  author = {Scott Southworth},
  year = {1998},
  doi = {10.3133/gq1761},
  url = {https://pubs.usgs.gov/publication/gq1761},
  note = {Source identifier: gq1761}
}