@misc{indiciaed55d10305d2e,
  title = {George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus — Illustration, [No.] 2007},
  url = {https://www.biodiversitylibrary.org/page/56166921},
  note = {Source identifier: page-56166921}
}