@misc{indiciae93a50c0c37a8,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1645},
  url = {https://www.biodiversitylibrary.org/page/56146407},
  note = {Source identifier: page-56146407}
}