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Rare Book Division, The New York Public Library. "21. The Barred Owl (Ulula nebulosa). 22. The Great Horned Owl (Bubo virginianus)." The New York Public Library Digital Collections. 1842 - 1844. https://digitalcollections.nypl.org/items/510d47d9-766a-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "21. The Barred Owl (Ulula nebulosa). 22. The Great Horned Owl (Bubo virginianus)." New York Public Library Digital Collections. Accessed February 6, 2025. https://digitalcollections.nypl.org/items/510d47d9-766a-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1842 - 1844). 21. The Barred Owl (Ulula nebulosa). 22. The Great Horned Owl (Bubo virginianus). Retrieved from https://digitalcollections.nypl.org/items/510d47d9-766a-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-766a-a3d9-e040-e00a18064a99 | title=
(still image)
21. The Barred Owl (Ulula nebulosa). 22. The Great Horned Owl (Bubo virginianus)., (1842 - 1844)
|author=Digital Collections, The New York Public Library |accessdate=February 6, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>