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© The New York Public Library, 2025
The New York Public Library is a 501(c)(3) | EIN 13-1887440
1918-20; Off-set printing; Unwatermarked, perforated 11 [1].
Manuscripts and Archives Division, The New York Public Library. "3c purple Washington block of eight error" The New York Public Library Digital Collections. 1918 - 1920. https://digitalcollections.nypl.org/items/5e66b3e8-7dd3-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. "3c purple Washington block of eight error" New York Public Library Digital Collections. Accessed February 7, 2025. https://digitalcollections.nypl.org/items/5e66b3e8-7dd3-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. (1918 - 1920). 3c purple Washington block of eight error Retrieved from https://digitalcollections.nypl.org/items/5e66b3e8-7dd3-d471-e040-e00a180654d7
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(still image)
3c purple Washington block of eight error, (1918 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=February 7, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>