@misc{indiciae921a66a5608a,
  title = {Sporomorphs from the Jackson Group (upper Eocene) and adjacent strata of Mississippi and western Alabama},
  author = {Norman O. Frederiksen},
  year = {1980},
  doi = {10.3133/pp1084},
  url = {https://pubs.usgs.gov/publication/pp1084},
  note = {Source identifier: pp1084}
}