@misc{indiciae97aad7f0aa01,
  title = {Wilderness permit compliance and validity},
  author = {J. W. van Wagtendonk and J.M. Benedict},
  year = {1980},
  doi = {10.1093/jof/78.7.399},
  url = {https://pubs.usgs.gov/publication/1007467},
  note = {Source identifier: 1007467}
}