@misc{indiciae59a7e041b1e5,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2156},
  url = {https://www.biodiversitylibrary.org/page/56154231},
  note = {Source identifier: page-56154231}
}