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General Research Division, The New York Public Library. "Cyanotype reproduction of seaweed (Ptilota Plumosa) ; Proceedings of the Royal Philosophical Society of Glasgow, Vol. XXI, 1889-90 [Title page]" The New York Public Library Digital Collections. 1890. https://qa-digitalcollections.nypl.org/items/a3182ef0-0065-0136-bd23-5bb8787ea02d
General Research Division, The New York Public Library. "Cyanotype reproduction of seaweed (Ptilota Plumosa) ; Proceedings of the Royal Philosophical Society of Glasgow, Vol. XXI, 1889-90 [Title page]" New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/a3182ef0-0065-0136-bd23-5bb8787ea02d
General Research Division, The New York Public Library. (1890). Cyanotype reproduction of seaweed (Ptilota Plumosa) ; Proceedings of the Royal Philosophical Society of Glasgow, Vol. XXI, 1889-90 [Title page] Retrieved from https://qa-digitalcollections.nypl.org/items/a3182ef0-0065-0136-bd23-5bb8787ea02d
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/a3182ef0-0065-0136-bd23-5bb8787ea02d | title=
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Cyanotype reproduction of seaweed (Ptilota Plumosa) ; Proceedings of the Royal Philosophical Society of Glasgow, Vol. XXI, 1889-90 [Title page], (1890)
|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>