@misc{indiciae150d968e5572,
  title = {Geology of the Harpers Ferry Quadrangle, Virginia, Maryland, and West Virginia},
  author = {Scott Southworth and David K. Brezinski},
  year = {1996},
  doi = {10.3133/b2123},
  url = {https://pubs.usgs.gov/publication/b2123},
  note = {Source identifier: b2123}
}