@misc{indiciae0a8b22bd1ff7,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2107},
  year = {1869},
  url = {https://www.biodiversitylibrary.org/page/56134347},
  note = {Source identifier: page-56134347}
}