@misc{indiciae78e5d54e46a3,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1721},
  year = {1880},
  url = {https://www.biodiversitylibrary.org/page/56143172},
  note = {Source identifier: page-56143172}
}