@misc{indiciaef32d5d5ab832,
  title = {Bedrock map and geotechnical properties of rocks of the Culpeper basin and vicinity, Virginia and Maryland},
  author = {B. D. Leavy and A.J. Froelich and E. C. Abram},
  year = {1983},
  doi = {10.3133/i1313c},
  url = {https://pubs.usgs.gov/publication/i1313C},
  note = {Source identifier: i1313C}
}