@misc{indiciae8dd5454cf80e,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2046},
  url = {https://www.biodiversitylibrary.org/page/56136774},
  note = {Source identifier: page-56136774}
}