@misc{indiciaebff0f51525ae,
  title = {Taxonomic revision of the Spermatopsida of the Oligocene Creede flora, southern Colorado},
  author = {Jack A. Wolfe and Howard E. Schorn},
  year = {1990},
  doi = {10.3133/b1923},
  url = {https://pubs.usgs.gov/publication/b1923},
  note = {Source identifier: b1923}
}