@misc{indiciae57cdc72b3865,
  title = {Floristic surveys of Saguaro National Park Protected Natural Areas},
  author = {W. L. Halvorson and B.S. Gebow},
  year = {2000},
  doi = {10.3133/2002312},
  url = {https://pubs.usgs.gov/publication/2002312},
  note = {Source identifier: 2002312}
}