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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 New Baltimore to Hudson" The New York Public Library Digital Collections. 1887. https://digitalcollections.nypl.org/items/2d5e8b60-8af7-0133-9e53-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch of the triangulation of the Hudson River from New Baltimore to Hudson" New York Public Library Digital Collections. Accessed March 28, 2024. https://digitalcollections.nypl.org/items/2d5e8b60-8af7-0133-9e53-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1887). Sketch of the triangulation of the Hudson River from New Baltimore to Hudson Retrieved from https://digitalcollections.nypl.org/items/2d5e8b60-8af7-0133-9e53-00505686a51c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/2d5e8b60-8af7-0133-9e53-00505686a51c | title=
(cartographic)
Sketch of the triangulation of the Hudson River from New Baltimore to Hudson, (1887)
|author=Digital Collections, The New York Public Library |accessdate=March 28, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>