@misc{indiciaef70b96f827bb,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1729},
  year = {1880},
  url = {https://www.biodiversitylibrary.org/page/56143190},
  note = {Source identifier: page-56143190}
}