@misc{indiciaece1936e48497,
  title = {2012 National Park visitor spending effects: economic contributions to local communities, states, and the nation},
  author = {Catherine Cullinane Thomas and Christopher C. Huber and Lynne Koontz},
  year = {2014},
  url = {https://pubs.usgs.gov/publication/70099241},
  note = {Source identifier: 70099241}
}