@misc{indiciaee2e8bc4dad77,
  title = {Map and geotechnical properties of surface materials of the Culpeper basin and vicinity, Virginia and Maryland},
  author = {A.J. Froelich},
  year = {1985},
  doi = {10.3133/i1313e},
  url = {https://pubs.usgs.gov/publication/i1313E},
  note = {Source identifier: i1313E}
}