@misc{indiciae67a3ff3a019c,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2037},
  url = {https://www.biodiversitylibrary.org/page/56141874},
  note = {Source identifier: page-56141874}
}