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Rare Book Division, The New York Public Library. "6. 7. The Marsh Harrier (Circus uliginosus). 8. The Duck Hawk (Falco anatum)." The New York Public Library Digital Collections. 1842 - 1844. https://digitalcollections.nypl.org/items/510d47d9-7663-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "6. 7. The Marsh Harrier (Circus uliginosus). 8. The Duck Hawk (Falco anatum)." New York Public Library Digital Collections. Accessed February 6, 2025. https://digitalcollections.nypl.org/items/510d47d9-7663-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1842 - 1844). 6. 7. The Marsh Harrier (Circus uliginosus). 8. The Duck Hawk (Falco anatum). Retrieved from https://digitalcollections.nypl.org/items/510d47d9-7663-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-7663-a3d9-e040-e00a18064a99 | title=
(still image)
6. 7. The Marsh Harrier (Circus uliginosus). 8. The Duck Hawk (Falco anatum)., (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>