@misc{indiciae0d4afba5c4e4,
  title = {No. 4: Synopsis of the flora of Colorado},
  author = {Ferdinand Vandeveer Hayden and Thomas C. Porter and John M. Coulter},
  year = {1874},
  doi = {10.3133/70038992},
  url = {https://pubs.usgs.gov/publication/70038992},
  note = {Source identifier: 70038992}
}