@misc{indiciaeaa20b7be7b43,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2146 [1] verso},
  url = {https://www.biodiversitylibrary.org/page/56150100},
  note = {Source identifier: page-56150100}
}