@misc{indiciae8b3f13a463fa,
  title = {Volunteer map data collection at the USGS},
  author = {B. Wolf Eric and Barbara S. Poore and Holly K. Caro and Greg D. Matthews},
  year = {2011},
  doi = {10.3133/fs20113103},
  url = {https://pubs.usgs.gov/publication/fs20113103},
  note = {Source identifier: fs20113103}
}