@misc{indiciaeda69cdd40c8f,
  title = {George Engelmann : botanical notebook 7 : Echinocactus, Echinopsis, and Cereus — Illustration, [No.] 1647 [1] verso},
  url = {https://www.biodiversitylibrary.org/page/56146412},
  note = {Source identifier: page-56146412}
}