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The New York Public Library is a 501(c)(3) | EIN 13-1887440
1911; Official U.S. Postal savings issue; Single line watermark; Perforated 12 [2].
Manuscripts and Archives Division, The New York Public Library. "50c dark green US Postal Savings Official Mail block of four" The New York Public Library Digital Collections. 1911. https://digitalcollections.nypl.org/items/5e66b3e8-aa62-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. "50c dark green US Postal Savings Official Mail block of four" New York Public Library Digital Collections. Accessed April 27, 2024. https://digitalcollections.nypl.org/items/5e66b3e8-aa62-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. (1911). 50c dark green US Postal Savings Official Mail block of four Retrieved from https://digitalcollections.nypl.org/items/5e66b3e8-aa62-d471-e040-e00a180654d7
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/5e66b3e8-aa62-d471-e040-e00a180654d7 | title=
(still image)
50c dark green US Postal Savings Official Mail block of four, (1911)
|author=Digital Collections, The New York Public Library |accessdate=April 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>