@misc{indiciae61be0a815940,
  title = {The physical conditions and age indicated by the flora of the Alum Bluff formation},
  author = {Edward Wilber Berry},
  year = {1917},
  doi = {10.3133/pp98e},
  url = {https://pubs.usgs.gov/publication/pp98E},
  note = {Source identifier: pp98E}
}