@misc{indiciaee1426b021d85,
  title = {Correspondence : Gray (Asa) and Engelmann (George), 1841-1883 — Illustration, Oct 10 / 1864 2},
  year = {1864},
  url = {https://www.biodiversitylibrary.org/page/42653239},
  note = {Source identifier: page-42653239}
}