@misc{indiciae3b142fa01c73,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 1989 1},
  url = {https://www.biodiversitylibrary.org/page/56210013},
  note = {Source identifier: page-56210013}
}