@misc{indiciae14b353216951,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2117},
  url = {https://www.biodiversitylibrary.org/page/56139891},
  note = {Source identifier: page-56139891}
}