@misc{indiciaea22a21af3b7d,
  title = {Estimating visitor use and economic contributions of National Park visitor spending},
  author = {Lynne Koontz and Catherine Cullinane Thomas},
  year = {2019},
  doi = {10.4324/9781351055789},
  url = {https://pubs.usgs.gov/publication/70210198},
  note = {Source identifier: 70210198}
}