@misc{indiciae70d313f10419,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2054},
  url = {https://www.biodiversitylibrary.org/page/56133736},
  note = {Source identifier: page-56133736}
}