@misc{indiciae2f9f240e8032,
  title = {Probabilistic and statistical relationships between number of vehicles and number of visitors at a geologic site in a National Park},
  author = {R. A. Crovelli},
  year = {1997},
  doi = {10.1007/bf02769624},
  url = {https://pubs.usgs.gov/publication/70019279},
  note = {Source identifier: 70019279}
}