@misc{indiciae5adff924252a,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2070},
  url = {https://www.biodiversitylibrary.org/page/56136783},
  note = {Source identifier: page-56136783}
}