@misc{indiciae4485d6faa2a9,
  title = {Correspondence : Gray (Asa) and Engelmann (George), 1841-1883 — Illustration, Jun 13 / 1848 2},
  year = {1848},
  url = {https://www.biodiversitylibrary.org/page/42127856},
  note = {Source identifier: page-42127856}
}