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© The New York Public Library, 2024
The New York Public Library is a 501(c)(3) | EIN 13-1887440
1904; Louisiana Purchase exposition issue; Double line watermark; Perforated 12 [2].
Manuscripts and Archives Division, The New York Public Library. "10c red brown Map of Louisiana Purchase block of four" The New York Public Library Digital Collections. 1904. https://digitalcollections.nypl.org/items/5e66b3e8-6c17-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. "10c red brown Map of Louisiana Purchase block of four" New York Public Library Digital Collections. Accessed May 12, 2024. https://digitalcollections.nypl.org/items/5e66b3e8-6c17-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. (1904). 10c red brown Map of Louisiana Purchase block of four Retrieved from https://digitalcollections.nypl.org/items/5e66b3e8-6c17-d471-e040-e00a180654d7
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/5e66b3e8-6c17-d471-e040-e00a180654d7 | title=
(still image)
10c red brown Map of Louisiana Purchase block of four, (1904)
|author=Digital Collections, The New York Public Library |accessdate=May 12, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>