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© The New York Public Library, 2024
The New York Public Library is a 501(c)(3) | EIN 13-1887440
1902-03; Double line watermark; Perforated 12; Overprinted for use in the Philippine Islands.
Manuscripts and Archives Division, The New York Public Library. "13c purple black Benjamin Harrison block of four" The New York Public Library Digital Collections. 1902 - 1903. https://digitalcollections.nypl.org/items/5e66b3e8-a1cd-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. "13c purple black Benjamin Harrison block of four" New York Public Library Digital Collections. Accessed April 19, 2024. https://digitalcollections.nypl.org/items/5e66b3e8-a1cd-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. (1902 - 1903). 13c purple black Benjamin Harrison block of four Retrieved from https://digitalcollections.nypl.org/items/5e66b3e8-a1cd-d471-e040-e00a180654d7
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/5e66b3e8-a1cd-d471-e040-e00a180654d7 | title=
(still image)
13c purple black Benjamin Harrison block of four, (1902 - 1903)
|author=Digital Collections, The New York Public Library |accessdate=April 19, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>