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The new and heretofore unfigured species of birds of North America
Rare Book Division, The New York Public Library. "Falco islandicus, Iceland falcon." The New York Public Library Digital Collections. 1869. https://digitalcollections.nypl.org/items/510d47da-4866-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "Falco islandicus, Iceland falcon." New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/510d47da-4866-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1869). Falco islandicus, Iceland falcon. Retrieved from https://digitalcollections.nypl.org/items/510d47da-4866-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-4866-a3d9-e040-e00a18064a99 | title=
(still image)
Falco islandicus, Iceland falcon., (1869)|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>