@misc{indiciae925d74b3ba0e,
  title = {A fossil flora from the Frontier formation of southwestern Wyoming},
  author = {F. H. Knowlton},
  year = {1917},
  doi = {10.3133/pp108f},
  url = {https://pubs.usgs.gov/publication/pp108F},
  note = {Source identifier: pp108F}
}