@misc{indiciaeaa51e9380995,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2147},
  url = {https://www.biodiversitylibrary.org/page/56150101},
  note = {Source identifier: page-56150101}
}