@misc{indiciae327b6e4eeded,
  title = {2016 National Park visitor spending effects: Economic contributions to local communities, states, and the Nation},
  author = {Catherine Cullinane Thomas and Lynne Koontz},
  year = {2017},
  url = {https://pubs.usgs.gov/publication/70191350},
  note = {Source identifier: 70191350}
}