@misc{indiciae5963e641d4a1,
  title = {Two new plant genera of Pennsylvanian age from Kansas coal balls},
  author = {S.H. Mamay},
  year = {1954},
  doi = {10.3133/pp254d},
  url = {https://pubs.usgs.gov/publication/pp254D},
  note = {Source identifier: pp254D}
}