@misc{indiciae438926d56ac4,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1717},
  year = {1880},
  url = {https://www.biodiversitylibrary.org/page/56143162},
  note = {Source identifier: page-56143162}
}