@misc{indiciae030c09f0b23d,
  title = {Management practices that concentrate visitor activities: Camping impact management at Isle Royale National Park, USA},
  author = {Jeffrey L. Marion and T. A. Farrell},
  year = {2002},
  doi = {10.1006/jema.2002.0584},
  url = {https://pubs.usgs.gov/publication/5224192},
  note = {Source identifier: 5224192}
}