@misc{indiciae021b43c1eebd,
  title = {Geologic map of the Bluemont quadrangle, Loudoun and Clarke Counties, Virginia},
  author = {Scott Southworth},
  year = {1994},
  doi = {10.3133/gq1739},
  url = {https://pubs.usgs.gov/publication/gq1739},
  note = {Source identifier: gq1739}
}