@misc{indiciae9c2f4c650a7e,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2043},
  url = {https://www.biodiversitylibrary.org/page/56136768},
  note = {Source identifier: page-56136768}
}