@misc{indiciaed06cbcfc1b12,
  title = {A new sphenopsid cone from Iowa},
  author = {S.H. Mamay},
  year = {1954},
  doi = {10.1093/oxfordjournals.aob.a083392},
  url = {https://pubs.usgs.gov/publication/70221461},
  note = {Source identifier: 70221461}
}