@misc{indiciaee7df45f6b342,
  title = {The science of trail surveys: Recreation ecology provides new tools for managing wilderness trails},
  author = {Jeffrey L. Marion and Jeremy F. Wimpey and Logan O. Park},
  year = {2011},
  url = {https://pubs.usgs.gov/publication/70009679},
  note = {Source identifier: 70009679}
}