@misc{indiciaea0d9f197cd5e,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2161},
  url = {https://www.biodiversitylibrary.org/page/56154241},
  note = {Source identifier: page-56154241}
}