@misc{indiciaea0aae7531050,
  title = {George Engelmann : botanical notebook 58 : Ephedra and Equisetum — Illustration, [No.] 13391},
  year = {1882},
  url = {https://www.biodiversitylibrary.org/page/56112381},
  note = {Source identifier: page-56112381}
}