@misc{indiciaeacad831cccec,
  title = {George Engelmann : botanical notebook 48 : Coniferae (Pinaceae) — Illustration, [No.] 10886},
  year = {1881},
  url = {https://www.biodiversitylibrary.org/page/55910611},
  note = {Source identifier: page-55910611}
}