@misc{indiciae094cf34a141d,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2056},
  url = {https://www.biodiversitylibrary.org/page/56133740},
  note = {Source identifier: page-56133740}
}