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Rare Book Division, The New York Public Library. "20. The Black Snake (Coluber constrictor). 21 The Chain Snake (Coluber getulus)." The New York Public Library Digital Collections. 1842 - 1844. https://digitalcollections.nypl.org/items/510d47d9-76f9-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "20. The Black Snake (Coluber constrictor). 21 The Chain Snake (Coluber getulus)." New York Public Library Digital Collections. Accessed February 12, 2025. https://digitalcollections.nypl.org/items/510d47d9-76f9-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1842 - 1844). 20. The Black Snake (Coluber constrictor). 21 The Chain Snake (Coluber getulus). Retrieved from https://digitalcollections.nypl.org/items/510d47d9-76f9-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-76f9-a3d9-e040-e00a18064a99 | title=
(still image)
20. The Black Snake (Coluber constrictor). 21 The Chain Snake (Coluber getulus)., (1842 - 1844)
|author=Digital Collections, The New York Public Library |accessdate=February 12, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>