@misc{indiciaef2550e509099,
  title = {Probabilistic and statistical relationships between number of vehicles and number of visitors at a geologic site in a national park},
  author = {Robert A. Crovelli},
  year = {1994},
  doi = {10.3133/ofr94560},
  url = {https://pubs.usgs.gov/publication/ofr94560},
  note = {Source identifier: ofr94560}
}