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© The New York Public Library, 2024
The New York Public Library is a 501(c)(3) | EIN 13-1887440
1908-09; Double line watermark; Unperforated; Heavy double transfer.
Manuscripts and Archives Division, The New York Public Library. "3c deep violet Washington horizontal pair" The New York Public Library Digital Collections. 1908 - 1909. https://digitalcollections.nypl.org/items/5e66b3e8-9052-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. "3c deep violet Washington horizontal pair" New York Public Library Digital Collections. Accessed April 24, 2024. https://digitalcollections.nypl.org/items/5e66b3e8-9052-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. (1908 - 1909). 3c deep violet Washington horizontal pair Retrieved from https://digitalcollections.nypl.org/items/5e66b3e8-9052-d471-e040-e00a180654d7
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/5e66b3e8-9052-d471-e040-e00a180654d7 | title=
(still image)
3c deep violet Washington horizontal pair, (1908 - 1909)
|author=Digital Collections, The New York Public Library |accessdate=April 24, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>