@misc{indiciae5144b5848c6a,
  title = {2019 National park visitor spending effects: Economic contributions to local communities, states, and the nation},
  author = {Catherine Cullinane Thomas and Lynne Koontz},
  year = {2020},
  url = {https://pubs.usgs.gov/publication/70211321},
  note = {Source identifier: 70211321}
}