@misc{indiciaeb87ca261dee5,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1704},
  year = {1870},
  url = {https://www.biodiversitylibrary.org/page/56167080},
  note = {Source identifier: page-56167080}
}