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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch showing the primary triangulation, together with the divide between the streams flowing to the Hudson and St. Lawrence Rivers" The New York Public Library Digital Collections. 1872. https://digitalcollections.nypl.org/items/c3f550c0-a284-0133-666e-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch showing the primary triangulation, together with the divide between the streams flowing to the Hudson and St. Lawrence Rivers" New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/c3f550c0-a284-0133-666e-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1872). Sketch showing the primary triangulation, together with the divide between the streams flowing to the Hudson and St. Lawrence Rivers Retrieved from https://digitalcollections.nypl.org/items/c3f550c0-a284-0133-666e-00505686a51c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/c3f550c0-a284-0133-666e-00505686a51c | title=
(cartographic)
Sketch showing the primary triangulation, together with the divide between the streams flowing to the Hudson and St. Lawrence Rivers, (1872)
|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>