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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch of the triangulation of the Hudson River from Troy to Albany" The New York Public Library Digital Collections. 1887. https://digitalcollections.nypl.org/items/c0f09100-8af4-0133-7a7b-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch of the triangulation of the Hudson River from Troy to Albany" New York Public Library Digital Collections. Accessed April 18, 2024. https://digitalcollections.nypl.org/items/c0f09100-8af4-0133-7a7b-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1887). Sketch of the triangulation of the Hudson River from Troy to Albany Retrieved from https://digitalcollections.nypl.org/items/c0f09100-8af4-0133-7a7b-00505686a51c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/c0f09100-8af4-0133-7a7b-00505686a51c | title=
(cartographic)
Sketch of the triangulation of the Hudson River from Troy to Albany, (1887)
|author=Digital Collections, The New York Public Library |accessdate=April 18, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>