@misc{indiciaed24c98f2d471,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2052},
  url = {https://www.biodiversitylibrary.org/page/56133732},
  note = {Source identifier: page-56133732}
}