@misc{indiciaea6af3ad0abfd,
  title = {Formal and informal trail monitoring protocols and baseline conditions: Great Falls Park and Potomac Gorge. Final research report},
  author = {Jeremy Wimpey and Jeffrey L. Marion},
  year = {2011},
  url = {https://pubs.usgs.gov/publication/70004552},
  note = {Source identifier: 70004552}
}