@misc{indiciae84a6b1432e73,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2061},
  url = {https://www.biodiversitylibrary.org/page/56139900},
  note = {Source identifier: page-56139900}
}