@misc{indiciae9ba075a9a0d3,
  title = {Fossil plants from the Tertiary lake beds of south-central Colorado},
  author = {F. H. Knowlton},
  year = {1923},
  doi = {10.3133/pp131g},
  url = {https://pubs.usgs.gov/publication/pp131G},
  note = {Source identifier: pp131G}
}