@misc{indiciaeca9afbf3356f,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2077},
  url = {https://www.biodiversitylibrary.org/page/56136799},
  note = {Source identifier: page-56136799}
}