@misc{indiciaecc1982e87235,
  title = {Digital geologic map and database of the Frederick 30 x 60 minute quadrangle, Maryland, Virginia, and West Virginia},
  author = {Scott Southworth and David K. Brezinski and Avery Drake and William C. Burton and Randall C. Orndorff and Albert J. Froelich and James E. digital compilation by Reddy and Danielle Denenny},
  year = {2002},
  doi = {10.3133/ofr02437},
  url = {https://pubs.usgs.gov/publication/ofr02437},
  note = {Source identifier: ofr02437}
}