@misc{indiciae114765b95d6b,
  title = {2021 National park visitor spending effects: Economic contributions to local communities, states, and the nation},
  author = {Catherine M. Cullinane Thomas and Matthew Flyr and Lynne Koontz},
  year = {2022},
  url = {https://pubs.usgs.gov/publication/70248097},
  note = {Source identifier: 70248097}
}