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The butterflies of the eastern United States and Canada, with special reference to New England
General Research Division, The New York Public Library. "Anatomical Details of Imago, mostly External." The New York Public Library Digital Collections. 1889. https://digitalcollections.nypl.org/items/510d47d9-6dd8-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Anatomical Details of Imago, mostly External." New York Public Library Digital Collections. Accessed February 19, 2025. https://digitalcollections.nypl.org/items/510d47d9-6dd8-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1889). Anatomical Details of Imago, mostly External. Retrieved from https://digitalcollections.nypl.org/items/510d47d9-6dd8-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-6dd8-a3d9-e040-e00a18064a99 | title=
(still image)
Anatomical Details of Imago, mostly External., (1889)
|author=Digital Collections, The New York Public Library |accessdate=February 19, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>