@misc{indiciaef1c3bdb869d2,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2068},
  url = {https://www.biodiversitylibrary.org/page/56139914},
  note = {Source identifier: page-56139914}
}