@misc{indiciae72440eca626c,
  title = {National Park Service socioeconomic monitoring pilot survey: Visitor spending analysis},
  author = {Catherine Cullinane Thomas and Egan Cornachione and Lynne Koontz and Christopher Keyes},
  year = {2019},
  url = {https://pubs.usgs.gov/publication/70204070},
  note = {Source identifier: 70204070}
}