@misc{indiciae18ea4fbc1fe2,
  title = {Informal trail monitoring protocols: Denali National Park and Preserve},
  author = {Jeffrey L. Marion and Jeremy Wimpey},
  year = {2011},
  doi = {10.3133/70156309},
  url = {https://pubs.usgs.gov/publication/70156309},
  note = {Source identifier: 70156309}
}