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Spencer Collection, The New York Public Library. "Zygnema deciminum" The New York Public Library Digital Collections. 1853-09. https://qa-digitalcollections.nypl.org/items/d8fd5ea0-0743-0135-6968-37be76f49649
Spencer Collection, The New York Public Library. "Zygnema deciminum" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/d8fd5ea0-0743-0135-6968-37be76f49649
Spencer Collection, The New York Public Library. (1853-09). Zygnema deciminum Retrieved from https://qa-digitalcollections.nypl.org/items/d8fd5ea0-0743-0135-6968-37be76f49649
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/d8fd5ea0-0743-0135-6968-37be76f49649 | title=
(still image)
Zygnema deciminum, (1853-09)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>