@misc{indiciaec78f2b94fd13,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1726},
  year = {1880},
  url = {https://www.biodiversitylibrary.org/page/56143184},
  note = {Source identifier: page-56143184}
}