@misc{indiciae0bfc3b0dc3fe,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1666},
  url = {https://www.biodiversitylibrary.org/page/56141650},
  note = {Source identifier: page-56141650}
}