@misc{indiciaefd8adf4457cf,
  title = {Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River Corridor, District of Columbia, Maryland, West Virginia, and Virginia},
  author = {Scott Southworth and David K. Brezinski and Randall C. Orndorff and John E. Repetski and Danielle M. Denenny},
  year = {2008},
  doi = {10.3133/pp1691},
  url = {https://pubs.usgs.gov/publication/pp1691},
  note = {Source identifier: pp1691}
}