@misc{indiciae88d70bd801a3,
  title = {George Engelmann : botanical notebook 48 : Coniferae (Pinaceae) — Illustration, [No.] 10850},
  year = {1881},
  url = {https://www.biodiversitylibrary.org/page/55893475},
  note = {Source identifier: page-55893475}
}