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Spencer Collection, The New York Public Library. "Ectocarpus littoralis" The New York Public Library Digital Collections. 1846. https://digitalcollections.nypl.org/items/e5787650-f22a-0134-6e5f-0bf9d88348ee
Spencer Collection, The New York Public Library. "Ectocarpus littoralis" New York Public Library Digital Collections. Accessed February 19, 2025. https://digitalcollections.nypl.org/items/e5787650-f22a-0134-6e5f-0bf9d88348ee
Spencer Collection, The New York Public Library. (1846). Ectocarpus littoralis Retrieved from https://digitalcollections.nypl.org/items/e5787650-f22a-0134-6e5f-0bf9d88348ee
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/e5787650-f22a-0134-6e5f-0bf9d88348ee | title=
(still image)
Ectocarpus littoralis, (1846)
|author=Digital Collections, The New York Public Library |accessdate=February 19, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>