@misc{indiciaec26a7e0a3fb0,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2099 verso},
  url = {https://www.biodiversitylibrary.org/page/56139963},
  note = {Source identifier: page-56139963}
}