@misc{indiciae0ed3d541a88a,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2138},
  year = {1869},
  url = {https://www.biodiversitylibrary.org/page/56133161},
  note = {Source identifier: page-56133161}
}