@misc{indiciaee9866b29386e,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2123},
  url = {https://www.biodiversitylibrary.org/page/56138282},
  note = {Source identifier: page-56138282}
}