@misc{indiciae1d303082733c,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2083},
  url = {https://www.biodiversitylibrary.org/page/56139927},
  note = {Source identifier: page-56139927}
}