@misc{indiciae06c3033efb4f,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1773 1},
  url = {https://www.biodiversitylibrary.org/page/56141386},
  note = {Source identifier: page-56141386}
}