@misc{indiciaec28a01d911f2,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1698},
  year = {1870},
  url = {https://www.biodiversitylibrary.org/page/56167064},
  note = {Source identifier: page-56167064}
}