@misc{indiciaee07286b66587,
  title = {Assessing recreation impacts to cliffs in Shenandoah National Park: Integrating visitor observation with trail and recreation site measurements},
  author = {K.T. Wood and S.R. Lawson and J. L. Marion},
  year = {2006},
  url = {https://pubs.usgs.gov/publication/5224728},
  note = {Source identifier: 5224728}
}