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Spencer Collection, The New York Public Library. "Ulva bullosa" The New York Public Library Digital Collections. 1853-09. https://digitalcollections.nypl.org/items/e9e523b0-0743-0135-43e4-13e4162ee525
Spencer Collection, The New York Public Library. "Ulva bullosa" New York Public Library Digital Collections. Accessed October 3, 2024. https://digitalcollections.nypl.org/items/e9e523b0-0743-0135-43e4-13e4162ee525
Spencer Collection, The New York Public Library. (1853-09). Ulva bullosa Retrieved from https://digitalcollections.nypl.org/items/e9e523b0-0743-0135-43e4-13e4162ee525
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/e9e523b0-0743-0135-43e4-13e4162ee525 | title=
(still image)
Ulva bullosa, (1853-09)
|author=Digital Collections, The New York Public Library |accessdate=October 3, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>