@misc{indiciae9f340dbd4137,
  title = {Correspondence : Gray (Asa) and Engelmann (George), 1841-1883 — Illustration, Jun 04 / 1856 3},
  year = {1856},
  url = {https://www.biodiversitylibrary.org/page/42635726},
  note = {Source identifier: page-42635726}
}