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© The New York Public Library, 2025
The New York Public Library is a 501(c)(3) | EIN 13-1887440
1915; Panama Pacific issue; Single line watermark; Perforated 10 [1].
Manuscripts and Archives Division, The New York Public Library. "2c carmine Pedro Miguel Locks, Panama Canal block of six"" The New York Public Library Digital Collections. 1915. https://digitalcollections.nypl.org/items/5e66b3e8-d0b7-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. "2c carmine Pedro Miguel Locks, Panama Canal block of six"" New York Public Library Digital Collections. Accessed March 16, 2025. https://digitalcollections.nypl.org/items/5e66b3e8-d0b7-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. (1915). 2c carmine Pedro Miguel Locks, Panama Canal block of six" Retrieved from https://digitalcollections.nypl.org/items/5e66b3e8-d0b7-d471-e040-e00a180654d7
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/5e66b3e8-d0b7-d471-e040-e00a180654d7 | title=
(still image)
2c carmine Pedro Miguel Locks, Panama Canal block of six", (1915)
|author=Digital Collections, The New York Public Library |accessdate=March 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>