@misc{indiciaea1bab6a39d6a,
  title = {Development and affinities of Tertiary floras in the Rocky Mountains},
  author = {Estella B. Leopold and Harry D. MacGinitie},
  year = {1972},
  url = {https://pubs.usgs.gov/publication/70252086},
  note = {Source identifier: 70252086}
}