@misc{indiciae603ba31a787c,
  title = {Correspondence : Eichler (August) and Engelmann (George), 1869-1882 — Illustration, Mar 30 / 1880 2},
  year = {1880},
  url = {https://www.biodiversitylibrary.org/page/43373621},
  note = {Source identifier: page-43373621}
}