@misc{indiciae70cb88c38e4e,
  title = {Recent discussions of the origin of gymnosperms},
  author = {E. W. Berry},
  year = {1907},
  doi = {10.1126/science.25.638.470},
  url = {https://pubs.usgs.gov/publication/70011141},
  note = {Source identifier: 70011141}
}