@misc{indiciae5594badea386,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1693},
  year = {1870},
  url = {https://www.biodiversitylibrary.org/page/56138973},
  note = {Source identifier: page-56138973}
}