@misc{indiciae66c12ac1b5d3,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1668},
  url = {https://www.biodiversitylibrary.org/page/56141654},
  note = {Source identifier: page-56141654}
}