@misc{indiciaeb38a695103dd,
  title = {Russellites, new genus, a problematical plant from the lower Permian of Texas},
  author = {S.H. Mamay},
  year = {1968},
  doi = {10.3133/pp593i},
  url = {https://pubs.usgs.gov/publication/pp593I},
  note = {Source identifier: pp593I}
}