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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch A, showing the primary triangulation in section no. 1, from 1844 to 1854" The New York Public Library Digital Collections. 1854. https://qa-digitalcollections.nypl.org/items/eccfcdd0-6949-0134-9503-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch A, showing the primary triangulation in section no. 1, from 1844 to 1854" New York Public Library Digital Collections. Accessed November 26, 2024. https://qa-digitalcollections.nypl.org/items/eccfcdd0-6949-0134-9503-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1854). Sketch A, showing the primary triangulation in section no. 1, from 1844 to 1854 Retrieved from https://qa-digitalcollections.nypl.org/items/eccfcdd0-6949-0134-9503-00505686a51c
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/eccfcdd0-6949-0134-9503-00505686a51c | title=
(cartographic)
Sketch A, showing the primary triangulation in section no. 1, from 1844 to 1854, (1854)
|author=Digital Collections, The New York Public Library |accessdate=November 26, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>