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Manuscripts and Archives Division, The New York Public Library. "10c carmine US Postal Savings Official Mail block of four" The New York Public Library Digital Collections. 1911. https://qa-digitalcollections.nypl.org/items/5e66b3e8-7b23-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. "10c carmine US Postal Savings Official Mail block of four" New York Public Library Digital Collections. Accessed December 12, 2024. https://qa-digitalcollections.nypl.org/items/5e66b3e8-7b23-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. (1911). 10c carmine US Postal Savings Official Mail block of four Retrieved from https://qa-digitalcollections.nypl.org/items/5e66b3e8-7b23-d471-e040-e00a180654d7
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/5e66b3e8-7b23-d471-e040-e00a180654d7 | title=
(still image)
10c carmine US Postal Savings Official Mail block of four, (1911)
|author=Digital Collections, The New York Public Library |accessdate=December 12, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>